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+++ b/README.md
@@ -11,6 +11,18 @@
 
 [![Build Status](https://travis-ci.org/Splode/pomotroid.svg?branch=master)](https://travis-ci.org/Splode/pomotroid)
 
+- [Overview](#overview)
+- [Features](#features)
+  - [Themes](#themes)
+- [Install](#install)
+  - [Download](#download)
+  - [Homebrew](#homebrew)
+  - [Scoop](#scoop)
+- [Roadmap](#roadmap)
+- [Development](#development)
+  - [Build Setup](#build-setup)
+- [License](#license)
+
 ## Overview
 
 Pomotroid is a simple and configurable Pomodoro timer. It aims to provide a visually-pleasing and reliable way to track productivity using the Pomodoro Technique.
@@ -23,9 +35,19 @@ Pomotroid is in its early stages, so feedback and contributions are welcome and
 - Charming timer alert sounds (optional)
 - Desktop notifications (optional)
 - Minimize to tray (optional)
+- Several themes included with the ability to create custom themes.
+- Timer activity logging.
+
+### Themes
+
+Pomotroid provides many themes. It's also theme-able, allowing you to customize its appearance.
+
+Visit the [theme documentation](./docs/themes/themes.md) to view the full list of official themes and for instruction on creating your own.
 
 ## Install
 
+### Download
+
 Download the latest version from the [releases](https://github.com/Splode/pomotroid/releases) page.
 
 Pomotroid is available for Windows, Mac OSX and Linux.
@@ -51,7 +73,6 @@ scoop install https://raw.githubusercontent.com/Splode/pomotroid/master/pomotroi
 :memo: Future plans for enhancements and development:
 
 - Mini-mode
-- Themes
 
 ## Development
 
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+{
+  "name": "Theme Name",
+  "colors": {
+    "--color-long-round": "",
+    "--color-short-round": "",
+    "--color-focus-round": "",
+    "--color-background": "",
+    "--color-background-light": "",
+    "--color-background-lightest": "",
+    "--color-foreground": "",
+    "--color-foreground-darker": "",
+    "--color-foreground-darkest": "",
+    "--color-accent": ""
+  }
+}
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@@ -0,0 +1,60 @@
+# Pomotroid Themes
+
+- [Pomotroid Themes](#pomotroid-themes)
+  - [Available Themes](#available-themes)
+  - [Creating a Custom Theme](#creating-a-custom-theme)
+
+## Available Themes
+
+| Theme               | Main App                                                                | Timer Colors                                                            |
+| ------------------- | ----------------------------------------------------------------------- | ----------------------------------------------------------------------- |
+| Andromeda           | ![Andromeda theme preview](images/andromeda_01.png)                     | ![Andromeda theme preview](images/andromeda_02.png)                     |
+| Ayu Mirage          | ![Ayu Mirage theme preview](images/ayu_01.png)                          | ![Ayu Mirage theme preview](images/ayu_02.png)                          |
+| City Lights         | ![City Lights theme preview](images/city-lights_01.png)                 | ![City Lights theme preview](images/city-lights_02.png)                 |
+| Dracula             | ![Dracula theme preview](images/dracula_01.png)                         | ![Dracula theme preview](images/dracula_02.png)                         |
+| D.Va                | ![D.Va theme preview](images/dva_01.png)                                | ![D.Va theme preview](images/dva_02.png)                                |
+| GitHub              | ![GitHub theme preview](images/github_01.png)                           | ![GitHub theme preview](images/github_02.png)                           |
+| Graphite            | ![Graphite theme preview](images/graphite_01.png)                       | ![Graphite theme preview](images/graphite_02.png)                       |
+| Gruvbox             | ![Gruvbox theme preview](images/gruvbox_01.png)                         | ![Gruvbox theme preview](images/gruvbox_02.png)                         |
+| Monokai             | ![Monokai theme preview](images/monokai_01.png)                         | ![Monokai theme preview](images/monokai_02.png)                         |
+| Nord                | ![Nord theme preview](images/nord_01.png)                               | ![Nord theme preview](images/nord_02.png)                               |
+| One Dark Pro        | ![One Dark Pro theme preview](images/one-dark-pro_01.png)               | ![One Dark Pro theme preview](images/one-dark-pro_02.png)               |
+| Pomotroid (default) | ![Pomotroid theme preview](images/pomotroid_01.png)                     | ![Pomotroid theme preview](images/pomotroid_02.png)                     |
+| Popping and Locking | ![Popping and Locking theme preview](images/popping-and-locking_01.png) | ![Popping and Locking theme preview](images/popping-and-locking_02.png) |
+| Solarized Light     | ![Solarized Light theme preview](images/solarized-light_01.png)         | ![Solarized Light theme preview](images/solarized-light_02.png)         |
+| Spandex             | ![Spandex theme preview](images/spandex_01.png)                         | ![Spandex theme preview](images/spandex_02.png)                         |
+| Sythwave            | ![Sythwave theme preview](images/synthwave_01.png)                      | ![Sythwave theme preview](images/synthwave_02.png)                      |
+| Tokyo Night Storm   | ![Tokyo Night Storm theme preview](images/tokyo-night-storm_01.png)     | ![Tokyo Night Storm theme preview](images/tokyo-night-storm_02.png)     |
+
+## Creating a Custom Theme
+
+Creating custom themes is simple. Themes are defined by a `json` file containing a **theme name** and several color values. Use the [theme template file](./theme-template.json) as a starting point.
+
+```json
+// theme-template.json
+{
+  "name": "Theme Name",
+  "colors": {
+    "--color-long-round": "",
+    "--color-short-round": "",
+    "--color-focus-round": "",
+    "--color-background": "",
+    "--color-background-light": "",
+    "--color-background-lightest": "",
+    "--color-foreground": "",
+    "--color-foreground-darker": "",
+    "--color-foreground-darkest": "",
+    "--color-accent": ""
+  }
+}
+```
+
+To add your custom theme, copy your theme definition to the `themes` directory in the `appData` directory. The location of the `appData` depends on the operating system.
+
+- `%APPDATA%` on **Windows**
+- `$XDG_CONFIG_HOME` or `~/.config` on **Linux**
+- `~/Library/Application Support` on **macOS**
+
+Copy your theme definition to the `themes` directory. For example, add the theme to the following directory on Windows: `C:\Users\{User}\AppData\Roaming\pomotroid\themes`
+
+Restart the application, and you should see your new theme available as an option.