diff --git a/gui.py b/gui.py
new file mode 100644
index 00000000..447a5b39
--- /dev/null
+++ b/gui.py
@@ -0,0 +1,105 @@
+import gi
+gi.require_version("Gtk", "3.0")
+from gi.repository import Gtk
+import os, subprocess
+
+class ColorManagerGUI(Gtk.Window):
+    def __init__(self):
+        super().__init__(title="Color Manager")
+
+        # Window setup.
+        self.set_default_size(300, 200)
+        self.set_position(Gtk.WindowPosition.CENTER)
+
+        # Top container setup.
+        container = Gtk.Box(orientation=Gtk.Orientation.VERTICAL)
+        self.add(container)
+        pages = Gtk.Notebook()
+        container.add(pages)
+
+        # Monochromatic page.
+        mono_page = Gtk.Box(orientation=Gtk.Orientation.VERTICAL, spacing=10)
+        pages.append_page(mono_page, Gtk.Label(label="Monochromatic", hexpand=True))
+        mono_container = Gtk.Box(orientation=Gtk.Orientation.VERTICAL, spacing=10)
+        mono_container.set_border_width(10)
+        mono_page.add(mono_container)
+        label = Gtk.Label(label="Choose a single color that will serve as the base color for your monochromatic icon pack variant.")
+        label.set_alignment(0,0)
+        label.set_line_wrap(True)
+        mono_container.add(label)
+
+        mono_color = Gtk.ColorButton()
+        mono_container.add(mono_color)
+
+        # Multichromatic page.
+        multi_page = Gtk.Box(orientation=Gtk.Orientation.VERTICAL, spacing=10)
+        pages.append_page(multi_page, Gtk.Label(label="Multichromatic", hexpand=True))
+
+        multi_container = Gtk.Box(orientation=Gtk.Orientation.VERTICAL, spacing=10)
+        multi_container.set_border_width(10)
+        multi_page.add(multi_container)
+        label = Gtk.Label(label="Choose a palette file containing a list of colors. Only these will occur in the new pack.")
+        label.set_alignment(0,0)
+        label.set_line_wrap(True)
+        multi_container.add(label)
+
+        palette_button = Gtk.FileChooserButton()
+        palette_button.set_title("Choose palette file")
+        multi_container.add(palette_button)
+
+        # About page.
+        about_page = Gtk.Box(orientation=Gtk.Orientation.VERTICAL, spacing=10)
+        pages.append_page(about_page, Gtk.Label(label="About", hexpand=True))
+        about_container = Gtk.Box(orientation=Gtk.Orientation.VERTICAL, spacing=10)
+        about_container.set_border_width(10)
+        about_page.add(about_container)
+        label = Gtk.Label()
+        label.set_markup("Color Manager is a program for recoloring existing svg-based icon packs as well as themes. The program is designed for <a href='https://github.com/NicklasVraa/NovaOS'>NovaOS</a>.\n\nCheck for updates on the project's <a href='https://github.com/NicklasVraa/Color-manager'>repository</a>.")
+        label.set_alignment(0,0)
+        label.set_line_wrap(True)
+        about_container.add(label)
+
+        # Shared container setup.
+        shared = Gtk.Box(orientation=Gtk.Orientation.VERTICAL, spacing=10)
+        shared.set_border_width(10)
+        container.add(shared)
+
+        # Input-output area.
+        io_area = Gtk.Box(spacing=10)
+        io_area.set_homogeneous(True)
+
+        dest_area = Gtk.Box(orientation=Gtk.Orientation.VERTICAL, spacing=10)
+        label = Gtk.Label(label="Name your pack:")
+        label.set_alignment(0,0)
+        dest_area.add(label)
+        dest_entry = Gtk.Entry()
+        dest_area.add(dest_entry)
+        io_area.add(dest_area)
+
+        src_area = Gtk.Box(orientation=Gtk.Orientation.VERTICAL, spacing=10)
+        label = Gtk.Label(label="Choose source pack:")
+        label.set_alignment(0,0)
+        src_area.add(label)
+        src_button = Gtk.FileChooserButton()
+        src_button.set_title("Choose source pack")
+        src_area.add(src_button)
+        io_area.add(src_area)
+        shared.add(io_area)
+
+        # Progress bar.
+        progress_bar = Gtk.ProgressBar()
+        shared.add(progress_bar)
+
+        gen_area = Gtk.Box(spacing=10)
+        button = Gtk.Button(label="Generate")
+        gen_area.add(button)
+        status = Gtk.Label(label="Status:")
+        status.set_alignment(0,0)
+        status.set_line_wrap(True)
+        gen_area.add(status)
+        shared.add(gen_area)
+
+win = ColorManagerGUI()
+win.connect("destroy", Gtk.main_quit)
+win.show_all()
+Gtk.main()
diff --git a/readme.md b/readme.md
index 25193226..742ca5e5 100644
--- a/readme.md
+++ b/readme.md
@@ -1,4 +1,4 @@
-# Color Manager <img src="icon.svg" width="50"/>
+# Color Manager <img src="resources/icon.svg" width="50"/>
 
 [Roadmap](#roadmap) | [Features](#features) | [Packs](#packs) | [Requests](#requests)
 
@@ -10,7 +10,7 @@ In the meantime, this repository will act as a preview and be home to recoloring
 - [x] Basic framework for manipulating icon packs.
 - [x] Grayscale, monochromatic and multichromatic recoloring functions.
 - [x] Command-line interface.
-- [ ] Graphical user interface based on the GTK framework.
+- [x] Graphical user interface based on the GTK framework.
 - [ ] Basic framework for manipulating GTK, Cinnamon and Metacity themes.
 - [ ] Intelligent color inversion function.
 - [ ] Python pip package.
@@ -26,6 +26,10 @@ Currently, three types of recoloring operations are supported:
 
 Speeds were recorded with an Intel i7-4770K CPU. Any svg-based icon pack can serve as the base for any color palette or monotone. For the best result when doing monochromatic recoloring, a pack where all icons have the same average saturation and lightness is recommended.
 
+A simple GUI is included with the program, but it is also possible to interact with it from a command line. The GUI will adopt your active theme.
+
+![GUI](resources/gui.png)
+
 ## Pack Previews <a name="packs"></a>
 Click sections to expand.
 <details>
diff --git a/resources/gui.png b/resources/gui.png
new file mode 100644
index 00000000..5a1e4fa6
Binary files /dev/null and b/resources/gui.png differ
diff --git a/icon.svg b/resources/icon.svg
similarity index 100%
rename from icon.svg
rename to resources/icon.svg