diff --git a/core/Cargo.toml b/core/Cargo.toml
index 2360e822..6e1f5ffb 100644
--- a/core/Cargo.toml
+++ b/core/Cargo.toml
@@ -23,6 +23,10 @@ xxhash-rust.workspace = true
 palette.workspace = true
 palette.optional = true
 
+serde.workspace = true
+serde.optional = true
+serde.features = ["derive"]
+
 [target.'cfg(windows)'.dependencies]
 raw-window-handle.workspace = true
 
diff --git a/core/src/color.rs b/core/src/color.rs
index b8db322f..a9a0aa55 100644
--- a/core/src/color.rs
+++ b/core/src/color.rs
@@ -3,6 +3,7 @@ use palette::rgb::{Srgb, Srgba};
 
 /// A color in the `sRGB` color space.
 #[derive(Debug, Clone, Copy, PartialEq, Default)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct Color {
     /// Red component, 0.0 - 1.0
     pub r: f32,
diff --git a/core/src/lib.rs b/core/src/lib.rs
index 002336ee..e46e8726 100644
--- a/core/src/lib.rs
+++ b/core/src/lib.rs
@@ -9,11 +9,12 @@
 #![doc(
     html_logo_url = "https://raw.githubusercontent.com/iced-rs/iced/9ab6923e943f784985e9ef9ca28b10278297225d/docs/logo.svg"
 )]
-#![forbid(unsafe_code, rust_2018_idioms)]
+#![forbid(unsafe_code)]
 #![deny(
     missing_debug_implementations,
     missing_docs,
     unused_results,
+    rust_2018_idioms,
     rustdoc::broken_intra_doc_links
 )]
 pub mod alignment;
diff --git a/debug/Cargo.toml b/debug/Cargo.toml
index 77cabf6a..5f63fb90 100644
--- a/debug/Cargo.toml
+++ b/debug/Cargo.toml
@@ -11,10 +11,11 @@ categories.workspace = true
 keywords.workspace = true
 
 [features]
-enable = ["iced_sentinel", "once_cell"]
+enable = ["dep:iced_sentinel", "dep:once_cell"]
 
 [dependencies]
 iced_core.workspace = true
+iced_style.workspace = true
 
 iced_sentinel.workspace = true
 iced_sentinel.optional = true
diff --git a/debug/src/lib.rs b/debug/src/lib.rs
index c02540ec..7bab52e9 100644
--- a/debug/src/lib.rs
+++ b/debug/src/lib.rs
@@ -1,4 +1,7 @@
 pub use iced_core as core;
+pub use iced_style as style;
+
+use crate::style::theme;
 
 pub use internal::Timer;
 
@@ -6,6 +9,10 @@ pub fn open_axe() {}
 
 pub fn log_message(_message: &impl std::fmt::Debug) {}
 
+pub fn theme_changed(palette: theme::Palette) {
+    internal::theme_changed(palette);
+}
+
 pub fn boot_time() -> Timer {
     internal::boot_time()
 }
@@ -41,6 +48,7 @@ pub fn time(name: impl AsRef<str>) -> Timer {
 #[cfg(feature = "enable")]
 mod internal {
     use crate::core::time::Instant;
+    use crate::style::theme;
 
     use iced_sentinel::client::{self, Client};
     use iced_sentinel::timing::{self, Timing};
@@ -48,6 +56,10 @@ mod internal {
     use once_cell::sync::Lazy;
     use std::sync::{Mutex, MutexGuard};
 
+    pub fn theme_changed(palette: theme::Palette) {
+        lock().sentinel.report_theme_change(palette);
+    }
+
     pub fn boot_time() -> Timer {
         timer(timing::Stage::Boot)
     }
@@ -120,6 +132,10 @@ mod internal {
 
 #[cfg(not(feature = "enable"))]
 mod internal {
+    use crate::style::theme;
+
+    pub fn theme_changed(_palette: theme::Palette) {}
+
     pub fn boot_time() -> Timer {
         Timer
     }
diff --git a/sentinel/Cargo.toml b/sentinel/Cargo.toml
index efb36659..c34c5048 100644
--- a/sentinel/Cargo.toml
+++ b/sentinel/Cargo.toml
@@ -12,6 +12,10 @@ keywords.workspace = true
 
 [dependencies]
 iced_core.workspace = true
+
+iced_style.workspace = true
+iced_style.features = ["serde"]
+
 serde_json.workspace = true
 futures.workspace = true
 log.workspace = true
diff --git a/sentinel/src/client.rs b/sentinel/src/client.rs
index ad1feb5d..5792dc85 100644
--- a/sentinel/src/client.rs
+++ b/sentinel/src/client.rs
@@ -1,3 +1,4 @@
+use crate::style::theme;
 use crate::{Input, Timing, SOCKET_ADDRESS};
 
 use tokio::io::{self, AsyncWriteExt};
@@ -11,6 +12,10 @@ pub struct Client {
 }
 
 impl Client {
+    pub fn report_theme_change(&mut self, palette: theme::Palette) {
+        let _ = self.sender.try_send(Input::ThemeChanged(palette));
+    }
+
     pub fn report_timing(&mut self, timing: Timing) {
         let _ = self.sender.try_send(Input::TimingMeasured(timing));
     }
diff --git a/sentinel/src/lib.rs b/sentinel/src/lib.rs
index 3d13c53d..c645ea49 100644
--- a/sentinel/src/lib.rs
+++ b/sentinel/src/lib.rs
@@ -1,8 +1,10 @@
 pub use iced_core as core;
+pub use iced_style as style;
 
 pub mod client;
 pub mod timing;
 
+use crate::style::theme;
 use crate::timing::Timing;
 
 use futures::future;
@@ -18,6 +20,7 @@ pub const SOCKET_ADDRESS: &str = "127.0.0.1:9167";
 pub enum Input {
     Connected(Version),
     TimingMeasured(Timing),
+    ThemeChanged(theme::Palette),
 }
 
 #[derive(Debug, Clone)]
@@ -25,6 +28,7 @@ pub enum Event {
     Connected(Version),
     Disconnected,
     TimingMeasured(Timing),
+    ThemeChanged(theme::Palette),
 }
 
 pub fn run() -> impl Stream<Item = Event> {
@@ -87,6 +91,9 @@ async fn receive(
                                 Input::TimingMeasured(timing) => {
                                     Event::TimingMeasured(timing)
                                 }
+                                Input::ThemeChanged(palette) => {
+                                    Event::ThemeChanged(palette)
+                                }
                             },
                         ))
                     }
diff --git a/style/Cargo.toml b/style/Cargo.toml
index 3f00e787..9f28c670 100644
--- a/style/Cargo.toml
+++ b/style/Cargo.toml
@@ -10,9 +10,16 @@ homepage.workspace = true
 categories.workspace = true
 keywords.workspace = true
 
+[features]
+serde = ["dep:serde", "iced_core/serde"]
+
 [dependencies]
 iced_core.workspace = true
 iced_core.features = ["palette"]
 
 palette.workspace = true
 once_cell.workspace = true
+
+serde.workspace = true
+serde.optional = true
+serde.features = ["derive"]
diff --git a/style/src/application.rs b/style/src/application.rs
index e9a1f4ff..db9a673a 100644
--- a/style/src/application.rs
+++ b/style/src/application.rs
@@ -1,5 +1,6 @@
 //! Change the appearance of an application.
-use iced_core::Color;
+use crate::core::Color;
+use crate::theme;
 
 /// A set of rules that dictate the style of an application.
 pub trait StyleSheet {
@@ -10,6 +11,17 @@ pub trait StyleSheet {
     ///
     /// [`Style`]: Self::Style
     fn appearance(&self, style: &Self::Style) -> Appearance;
+
+    /// Returns the [`theme::Palette`] of the application, if any.
+    ///
+    /// This may be used by other parts of the `iced` runtime to
+    /// try to match the style of your application.
+    ///
+    /// For instance, the Iced Axe uses this [`theme::Palette`] to
+    /// automatically style itself using your application's colors.
+    fn palette(&self) -> Option<theme::Palette> {
+        None
+    }
 }
 
 /// The appearance of an application.
diff --git a/style/src/lib.rs b/style/src/lib.rs
index 3c2865eb..67fcad52 100644
--- a/style/src/lib.rs
+++ b/style/src/lib.rs
@@ -7,11 +7,12 @@
 #![doc(
     html_logo_url = "https://raw.githubusercontent.com/iced-rs/iced/9ab6923e943f784985e9ef9ca28b10278297225d/docs/logo.svg"
 )]
-#![forbid(unsafe_code, rust_2018_idioms)]
+#![forbid(unsafe_code)]
 #![deny(
     unused_results,
     missing_docs,
     unused_results,
+    rust_2018_idioms,
     rustdoc::broken_intra_doc_links
 )]
 pub use iced_core as core;
diff --git a/style/src/theme/palette.rs b/style/src/theme/palette.rs
index 15a964cd..74a8253a 100644
--- a/style/src/theme/palette.rs
+++ b/style/src/theme/palette.rs
@@ -8,6 +8,7 @@ use palette::{FromColor, Hsl, Mix};
 
 /// A color palette.
 #[derive(Debug, Clone, Copy, PartialEq)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct Palette {
     /// The background [`Color`] of the [`Palette`].
     pub background: Color,
diff --git a/winit/src/application/state.rs b/winit/src/application/state.rs
index 14c4507f..b70d8dc2 100644
--- a/winit/src/application/state.rs
+++ b/winit/src/application/state.rs
@@ -2,6 +2,7 @@ use crate::application::{self, StyleSheet as _};
 use crate::conversion;
 use crate::core::mouse;
 use crate::core::{Color, Size};
+use crate::debug;
 use crate::graphics::Viewport;
 use crate::Application;
 
@@ -37,6 +38,8 @@ where
         let theme = application.theme();
         let appearance = theme.appearance(&application.style());
 
+        let _ = theme.palette().map(debug::theme_changed);
+
         let viewport = {
             let physical_size = window.inner_size();
 
@@ -211,5 +214,7 @@ where
         // Update theme and appearance
         self.theme = application.theme();
         self.appearance = self.theme.appearance(&application.style());
+
+        let _ = self.theme.palette().map(debug::theme_changed);
     }
 }