diff --git a/CREDITS.md b/CREDITS.md
index 5b9979f4..4254ed59 100644
--- a/CREDITS.md
+++ b/CREDITS.md
@@ -1,9 +1,9 @@
 # FIGfonts
 
 PageTop utiliza el paquete [figlet-rs](https://crates.io/crates/figlet-rs) de
-*yuanbohan*, que muestra al inicio de la ejecución un rótulo con el nombre de
+*yuanbohan*. Muestra en el terminal un rótulo de presentación con el nombre de
 la aplicación usando caracteres [FIGlet](http://www.figlet.org/). Las fuentes
-incluidas en `resources` son:
+incluidas en `src/app/banner` son:
 
 * [slant.flf](http://www.figlet.org/fontdb_example.cgi?font=slant.flf)
   por *Glenn Chappell*.
@@ -13,3 +13,10 @@ incluidas en `resources` son:
   por *Claude Martins*.
 * [starwars.flf](http://www.figlet.org/fontdb_example.cgi?font=starwars.flf)
   por *Ryan Youck*.
+
+# Icono
+
+El monstruo sonriente de Frankenstein es una divertida creación de
+[Webalys](https://www.iconfinder.com/webalys). Puede encontrarse en su colección
+[Nasty Icons](https://www.iconfinder.com/iconsets/nasty) disponible en
+[ICONFINDER](https://www.iconfinder.com/).
\ No newline at end of file
diff --git a/config/default.toml b/config/default.toml
index 5b6982fe..13012a93 100644
--- a/config/default.toml
+++ b/config/default.toml
@@ -15,7 +15,7 @@ db_user = "drust"
 db_pass = "DrU__#3T"
 
 [log]
-tracing = "Info,sqlx::query=Warn"
+tracing = "Info,pagetop=Debug,sqlx::query=Warn"
 
 [dev]
 #static_files = "pagetop/static"
diff --git a/pagetop-admin/src/lib.rs b/pagetop-admin/src/lib.rs
index e3ad0337..a00e7fae 100644
--- a/pagetop-admin/src/lib.rs
+++ b/pagetop-admin/src/lib.rs
@@ -7,6 +7,10 @@ mod summary;
 pub struct AdminModule;
 
 impl ModuleTrait for AdminModule {
+    fn name(&self) -> &'static str {
+        "Admin"
+    }
+
     fn fullname(&self) -> String {
         l("module_fullname")
     }
diff --git a/pagetop-node/src/lib.rs b/pagetop-node/src/lib.rs
index af6d8b3f..afcd729f 100644
--- a/pagetop-node/src/lib.rs
+++ b/pagetop-node/src/lib.rs
@@ -8,6 +8,10 @@ mod migration;
 pub struct NodeModule;
 
 impl ModuleTrait for NodeModule {
+    fn name(&self) -> &'static str {
+        "Node"
+    }
+
     fn fullname(&self) -> String {
         l("module_fullname")
     }
diff --git a/pagetop-user/src/lib.rs b/pagetop-user/src/lib.rs
index c76233e1..343daa7a 100644
--- a/pagetop-user/src/lib.rs
+++ b/pagetop-user/src/lib.rs
@@ -8,6 +8,10 @@ mod migration;
 pub struct UserModule;
 
 impl ModuleTrait for UserModule {
+    fn name(&self) -> &'static str {
+        "User"
+    }
+
     fn fullname(&self) -> String {
         l("module_fullname")
     }
diff --git a/pagetop/Cargo.toml b/pagetop/Cargo.toml
index 4d92b378..a260d17f 100644
--- a/pagetop/Cargo.toml
+++ b/pagetop/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "pagetop"
-version = "0.0.3"
+version = "0.0.4"
 edition = "2021"
 
 authors = [
diff --git a/pagetop/src/app/application.rs b/pagetop/src/app/application.rs
index 4ed2c1da..070390c8 100644
--- a/pagetop/src/app/application.rs
+++ b/pagetop/src/app/application.rs
@@ -27,13 +27,18 @@ impl Application {
         #[cfg(any(feature = "mysql", feature = "postgres", feature = "sqlite"))]
         Lazy::force(&app::db::DBCONN);
 
+        // Registra los temas predeterminados.
+        theme::register_theme(&base::theme::aliner::AlinerTheme);
+        theme::register_theme(&base::theme::minimal::MinimalTheme);
+        theme::register_theme(&base::theme::bootsier::BootsierTheme);
+
         // Ejecuta la función de inicio de la aplicación.
         trace::info!("Calling application bootstrap");
         let _ = &bootstrap();
 
-        // Registra el módulo para una página de presentación de PageTop.
+        // Registra el módulo de presentación de PageTop.
         // Normalmente se sobrecargará en la función de inicio.
-        module::register_module(&base::module::homepage::HomepageModule);
+        module::register_module(&base::module::demopage::DemopageModule);
 
         // Actualizaciones pendientes de la base de datos (opcional).
         #[cfg(any(feature = "mysql", feature = "postgres", feature = "sqlite"))]
diff --git a/pagetop/src/base/component/block.rs b/pagetop/src/base/component/block.rs
index 4f658c9e..96fce677 100644
--- a/pagetop/src/base/component/block.rs
+++ b/pagetop/src/base/component/block.rs
@@ -71,7 +71,7 @@ impl Block {
     }
 
     pub fn with_title(mut self, title: &str) -> Self {
-        self.title = util::optional_str(title);
+        self.title = util::valid_str(title);
         self
     }
 
diff --git a/pagetop/src/base/component/form/button.rs b/pagetop/src/base/component/form/button.rs
index c76c49dd..57810fea 100644
--- a/pagetop/src/base/component/form/button.rs
+++ b/pagetop/src/base/component/form/button.rs
@@ -101,7 +101,7 @@ impl Button {
     }
 
     pub fn with_value(mut self, value: &str) -> Self {
-        self.value = util::optional_str(value);
+        self.value = util::valid_str(value);
         self
     }
 
diff --git a/pagetop/src/base/component/form/date.rs b/pagetop/src/base/component/form/date.rs
index ccc6ab31..6614670a 100644
--- a/pagetop/src/base/component/form/date.rs
+++ b/pagetop/src/base/component/form/date.rs
@@ -112,17 +112,17 @@ impl Date {
     }
 
     pub fn with_value(mut self, value: &str) -> Self {
-        self.value = util::optional_str(value);
+        self.value = util::valid_str(value);
         self
     }
 
     pub fn with_label(mut self, label: &str) -> Self {
-        self.label = util::optional_str(label);
+        self.label = util::valid_str(label);
         self
     }
 
     pub fn with_placeholder(mut self, placeholder: &str) -> Self {
-        self.placeholder = util::optional_str(placeholder);
+        self.placeholder = util::valid_str(placeholder);
         self
     }
 
@@ -167,7 +167,7 @@ impl Date {
     }
 
     pub fn with_help_text(mut self, help_text: &str) -> Self {
-        self.help_text = util::optional_str(help_text);
+        self.help_text = util::valid_str(help_text);
         self
     }
 
diff --git a/pagetop/src/base/component/form/form.rs b/pagetop/src/base/component/form/form.rs
index 63eace0c..2fac4403 100644
--- a/pagetop/src/base/component/form/form.rs
+++ b/pagetop/src/base/component/form/form.rs
@@ -76,7 +76,7 @@ impl Form {
     }
 
     pub fn with_action(mut self, action: &str) -> Self {
-        self.action = util::optional_str(action);
+        self.action = util::valid_str(action);
         self
     }
 
@@ -86,7 +86,7 @@ impl Form {
     }
 
     pub fn with_charset(mut self, charset: &str) -> Self {
-        self.charset = util::optional_str(charset);
+        self.charset = util::valid_str(charset);
         self
     }
 
diff --git a/pagetop/src/base/component/form/hidden.rs b/pagetop/src/base/component/form/hidden.rs
index 9ac0a4f9..bd158b85 100644
--- a/pagetop/src/base/component/form/hidden.rs
+++ b/pagetop/src/base/component/form/hidden.rs
@@ -54,7 +54,7 @@ impl Hidden {
     }
 
     pub fn with_value(mut self, value: &str) -> Self {
-        self.value = util::optional_str(value);
+        self.value = util::valid_str(value);
         self
     }
 
diff --git a/pagetop/src/base/component/form/input.rs b/pagetop/src/base/component/form/input.rs
index 884d2232..f0e73a63 100644
--- a/pagetop/src/base/component/form/input.rs
+++ b/pagetop/src/base/component/form/input.rs
@@ -167,12 +167,12 @@ impl Input {
     }
 
     pub fn with_value(mut self, value: &str) -> Self {
-        self.value = util::optional_str(value);
+        self.value = util::valid_str(value);
         self
     }
 
     pub fn with_label(mut self, label: &str) -> Self {
-        self.label = util::optional_str(label);
+        self.label = util::valid_str(label);
         self
     }
 
@@ -192,7 +192,7 @@ impl Input {
     }
 
     pub fn with_placeholder(mut self, placeholder: &str) -> Self {
-        self.placeholder = util::optional_str(placeholder);
+        self.placeholder = util::valid_str(placeholder);
         self
     }
 
@@ -237,7 +237,7 @@ impl Input {
     }
 
     pub fn with_help_text(mut self, help_text: &str) -> Self {
-        self.help_text = util::optional_str(help_text);
+        self.help_text = util::valid_str(help_text);
         self
     }
 
diff --git a/pagetop/src/base/module/homepage/locales/en-US/homepage.ftl b/pagetop/src/base/module/demopage/locales/en-US/demopage.ftl
similarity index 95%
rename from pagetop/src/base/module/homepage/locales/en-US/homepage.ftl
rename to pagetop/src/base/module/demopage/locales/en-US/demopage.ftl
index 39a5e426..14c93f2f 100644
--- a/pagetop/src/base/module/homepage/locales/en-US/homepage.ftl
+++ b/pagetop/src/base/module/demopage/locales/en-US/demopage.ftl
@@ -1,5 +1,5 @@
 module_fullname = Default homepage
-module_description = Displays a default homepage when none is configured.
+module_description = Displays a demo homepage when none is configured.
 
 page_title = Hello world!
 
diff --git a/pagetop/src/base/module/homepage/locales/es-ES/homepage.ftl b/pagetop/src/base/module/demopage/locales/es-ES/demopage.ftl
similarity index 93%
rename from pagetop/src/base/module/homepage/locales/es-ES/homepage.ftl
rename to pagetop/src/base/module/demopage/locales/es-ES/demopage.ftl
index f1d85b2e..39720fcd 100644
--- a/pagetop/src/base/module/homepage/locales/es-ES/homepage.ftl
+++ b/pagetop/src/base/module/demopage/locales/es-ES/demopage.ftl
@@ -1,5 +1,5 @@
 module_fullname = Página de inicio predeterminada
-module_description = Muestra una página de inicio predeterminada cuando no hay ninguna configurada.
+module_description = Muestra una página de demostración predeterminada cuando no hay ninguna configurada.
 
 page_title = ¡Hola mundo!
 
diff --git a/pagetop/src/base/module/homepage/mod.rs b/pagetop/src/base/module/demopage/mod.rs
similarity index 91%
rename from pagetop/src/base/module/homepage/mod.rs
rename to pagetop/src/base/module/demopage/mod.rs
index bd364534..bb6e3b94 100644
--- a/pagetop/src/base/module/homepage/mod.rs
+++ b/pagetop/src/base/module/demopage/mod.rs
@@ -1,10 +1,14 @@
 use crate::prelude::*;
 
-localize!("src/base/module/homepage/locales");
+localize!("src/base/module/demopage/locales");
 
-pub struct HomepageModule;
+pub struct DemopageModule;
+
+impl ModuleTrait for DemopageModule {
+    fn name(&self) -> &'static str {
+        "Demopage"
+    }
 
-impl ModuleTrait for HomepageModule {
     fn fullname(&self) -> String {
         l("module_fullname")
     }
@@ -20,9 +24,13 @@ impl ModuleTrait for HomepageModule {
 
 async fn home() -> app::Result<Markup> {
     Page::prepare()
+        .using_theme("Bootsier")
         .with_title(
             l("page_title").as_str()
         )
+
+
+
         .add_to("content", Container::prepare()
             .with_id("welcome")
             .add(Chunck::markup(html! {
diff --git a/pagetop/src/base/module/mod.rs b/pagetop/src/base/module/mod.rs
index 070e5b82..7107d180 100644
--- a/pagetop/src/base/module/mod.rs
+++ b/pagetop/src/base/module/mod.rs
@@ -1 +1 @@
-pub mod homepage;
+pub mod demopage;
diff --git a/pagetop/src/base/theme/aliner/mod.rs b/pagetop/src/base/theme/aliner/mod.rs
index 07b1470f..d4f4f252 100644
--- a/pagetop/src/base/theme/aliner/mod.rs
+++ b/pagetop/src/base/theme/aliner/mod.rs
@@ -6,7 +6,7 @@ pub struct AlinerTheme;
 
 impl ThemeTrait for AlinerTheme {
     fn name(&self) -> &'static str {
-        "aliner"
+        "Aliner"
     }
 
     fn fullname(&self) -> String {
@@ -19,6 +19,10 @@ impl ThemeTrait for AlinerTheme {
 
     fn before_render_page(&self, page: &mut Page) {
         page.assets()
+            .with_favicon(
+                Favicon::new()
+                    .with_icon("/theme/favicon.png")
+            )
             .add_stylesheet(
                 StyleSheet::source(
                     "/aliner/css/styles.css"
diff --git a/pagetop/src/base/theme/bootsier/mod.rs b/pagetop/src/base/theme/bootsier/mod.rs
index dbd31727..ada65b0e 100644
--- a/pagetop/src/base/theme/bootsier/mod.rs
+++ b/pagetop/src/base/theme/bootsier/mod.rs
@@ -8,7 +8,7 @@ pub struct BootsierTheme;
 
 impl ThemeTrait for BootsierTheme {
     fn name(&self) -> &'static str {
-        "bootsier"
+        "Bootsier"
     }
 
     fn fullname(&self) -> String {
@@ -23,7 +23,7 @@ impl ThemeTrait for BootsierTheme {
         page.assets()
             .with_favicon(
                 Favicon::new()
-                    .with_icon("/bootsier/favicon.png")
+                    .with_icon("/theme/favicon.png")
             )
             .add_stylesheet(
                 StyleSheet::source(
diff --git a/pagetop/src/base/theme/minimal/mod.rs b/pagetop/src/base/theme/minimal/mod.rs
index b3a50906..471b3738 100644
--- a/pagetop/src/base/theme/minimal/mod.rs
+++ b/pagetop/src/base/theme/minimal/mod.rs
@@ -4,7 +4,7 @@ pub struct MinimalTheme;
 
 impl ThemeTrait for MinimalTheme {
     fn name(&self) -> &'static str {
-        "minimal"
+        "Minimal"
     }
 
     fn fullname(&self) -> String {
diff --git a/pagetop/src/module/all.rs b/pagetop/src/module/all.rs
index 120c59b6..c95583e9 100644
--- a/pagetop/src/module/all.rs
+++ b/pagetop/src/module/all.rs
@@ -10,13 +10,24 @@ static MODULES: Lazy<RwLock<Vec<&dyn ModuleTrait>>> = Lazy::new(|| {
 });
 
 pub fn register_module(module: &'static dyn ModuleTrait) {
-    let mut modules = MODULES.write().unwrap();
-    match modules.iter().find(|m| m.name() == module.name()) {
-        None => {
-            trace::info!("{}", module.name());
-            modules.push(module);
-        },
-        Some(_) => {},
+    let mut list: Vec<&dyn ModuleTrait> = Vec::new();
+    add_to(&mut list, module);
+    list.reverse();
+    MODULES.write().unwrap().append(&mut list);
+}
+
+fn add_to(list: &mut Vec<&dyn ModuleTrait>, module: &'static dyn ModuleTrait) {
+    if !MODULES.read().unwrap().iter().any(|m| m.name() == module.name()) {
+        if !list.iter().any(|m| m.name() == module.name()) {
+            trace::debug!("Registering \"{}\" module", module.name());
+            list.push(module);
+
+            let mut dependencies = module.dependencies();
+            dependencies.reverse();
+            for d in dependencies.iter() {
+                add_to(list, *d);
+            }
+        }
     }
 }
 
diff --git a/pagetop/src/module/definition.rs b/pagetop/src/module/definition.rs
index 9424fbd8..b01f9801 100644
--- a/pagetop/src/module/definition.rs
+++ b/pagetop/src/module/definition.rs
@@ -3,17 +3,9 @@ use crate::app;
 #[cfg(any(feature = "mysql", feature = "postgres", feature = "sqlite"))]
 use crate::db;
 
-use std::any::type_name;
-
 /// Los módulos deben implementar este *trait*.
 pub trait ModuleTrait: Send + Sync {
-    fn name(&self) -> &'static str {
-        let name = type_name::<Self>();
-        match name.rfind("::") {
-            Some(position) => &name[(position + 2)..],
-            None => name
-        }
-    }
+    fn name(&self) -> &'static str;
 
     fn fullname(&self) -> String;
 
diff --git a/pagetop/src/response/page/page.rs b/pagetop/src/response/page/page.rs
index 58541d22..eff38daa 100644
--- a/pagetop/src/response/page/page.rs
+++ b/pagetop/src/response/page/page.rs
@@ -75,7 +75,7 @@ impl<'a> Page<'a> {
     // Page BUILDER.
 
     pub fn with_language(&mut self, language: &str) -> &mut Self {
-        self.language = util::optional_str(language);
+        self.language = util::valid_str(language);
         self
     }
 
@@ -89,12 +89,12 @@ impl<'a> Page<'a> {
     }
 
     pub fn with_title(&mut self, title: &str) -> &mut Self {
-        self.title = util::optional_str(title);
+        self.title = util::valid_str(title);
         self
     }
 
     pub fn with_description(&mut self, description: &str) -> &mut Self {
-        self.description = util::optional_str(description);
+        self.description = util::valid_str(description);
         self
     }
 
diff --git a/pagetop/src/theme/all.rs b/pagetop/src/theme/all.rs
index cc25d9d8..ee0bfedb 100644
--- a/pagetop/src/theme/all.rs
+++ b/pagetop/src/theme/all.rs
@@ -1,4 +1,4 @@
-use crate::{Lazy, app, base, theme_static_files, trace};
+use crate::{Lazy, app, theme_static_files, trace};
 use super::ThemeTrait;
 
 use std::sync::RwLock;
@@ -7,21 +7,14 @@ include!(concat!(env!("OUT_DIR"), "/theme.rs"));
 
 // Temas registrados.
 static THEMES: Lazy<RwLock<Vec<&dyn ThemeTrait>>> = Lazy::new(|| {
-    RwLock::new(vec![
-        &base::theme::aliner::AlinerTheme,
-        &base::theme::minimal::MinimalTheme,
-        &base::theme::bootsier::BootsierTheme,
-    ])
+    RwLock::new(Vec::new())
 });
 
 pub fn register_theme(theme: &'static dyn ThemeTrait) {
     let mut themes = THEMES.write().unwrap();
-    match themes.iter().find(|t| t.name() == theme.name()) {
-        None => {
-            trace::info!("{}", theme.name());
-            themes.push(theme);
-        },
-        Some(_) => {},
+    if !themes.iter().any(|t| t.name() == theme.name()) {
+        trace::debug!("Registering \"{}\" theme", theme.name());
+        themes.push(theme);
     }
 }
 
diff --git a/pagetop/src/theme/definition.rs b/pagetop/src/theme/definition.rs
index 727df347..733736e2 100644
--- a/pagetop/src/theme/definition.rs
+++ b/pagetop/src/theme/definition.rs
@@ -1,7 +1,7 @@
 use crate::app;
 use crate::config::SETTINGS;
 use crate::html::{Markup, html};
-use crate::response::page::{Page, PageAssets, PageComponent};
+use crate::response::page::{Favicon, Page, PageAssets, PageComponent};
 use crate::base::component::Chunck;
 
 /// Los temas deben implementar este "trait".
@@ -20,6 +20,11 @@ pub trait ThemeTrait: Send + Sync {
 
     #[allow(unused_variables)]
     fn before_render_page(&self, page: &mut Page) {
+        page.assets()
+            .with_favicon(
+                Favicon::new()
+                    .with_icon("/theme/favicon.png")
+            );
     }
 
     fn render_page_head(&self, page: &mut Page) -> Markup {
diff --git a/pagetop/src/util.rs b/pagetop/src/util.rs
index c5254618..4ba4f76e 100644
--- a/pagetop/src/util.rs
+++ b/pagetop/src/util.rs
@@ -37,24 +37,24 @@ macro_rules! theme_static_files {
 }
 
 pub fn valid_id(id: &str) -> Option<String> {
-    let id = id.trim().replace(" ", "_").to_lowercase();
+    let id = id.trim();
     match id.is_empty() {
         true => None,
-        false => Some(id),
+        false => Some(id.replace(" ", "_").to_lowercase()),
     }
 }
 
-pub fn optional_str(s: &str) -> Option<String> {
-    let s = s.to_owned();
+pub fn valid_str(s: &str) -> Option<String> {
+    let s = s.trim();
     match s.is_empty() {
         true => None,
-        false => Some(s),
+        false => Some(s.to_owned()),
     }
 }
 
 pub fn assigned_str(optional: &Option<String>) -> &str {
     match optional {
         Some(o) => o.as_str(),
-        _ => "",
+        None => "",
     }
 }
diff --git a/pagetop/static/theme/favicon.png b/pagetop/static/theme/favicon.png
new file mode 100644
index 00000000..7d38ea4a
Binary files /dev/null and b/pagetop/static/theme/favicon.png differ