diff --git a/emmental.png b/data/emmental.png
similarity index 100%
rename from emmental.png
rename to data/emmental.png
diff --git a/emmental.svg b/data/hicolor/scalable/apps/emmental.svg
similarity index 100%
rename from emmental.svg
rename to data/hicolor/scalable/apps/emmental.svg
diff --git a/trier/generate_tracks.py b/trier/generate_tracks.py
index 7f71caa..9d4e211 100644
--- a/trier/generate_tracks.py
+++ b/trier/generate_tracks.py
@@ -10,7 +10,7 @@ trier  = os.path.abspath("trier")
 ffmpeg = "ffmpeg -hide_banner -nostdin -f s16le -i /dev/zero -codec libvorbis -loglevel warning".split()
 
 image = mutagen.flac.Picture()
-image.data   = open("emmental.png", "rb").read()
+image.data   = open("data/emmental.png", "rb").read()
 image.type   = mutagen.id3.PictureType.COVER_FRONT
 image.mime   = u"image/png"
 image.width  = 512
diff --git a/ui/__init__.py b/ui/__init__.py
index fce13b0..15b67e5 100644
--- a/ui/__init__.py
+++ b/ui/__init__.py
@@ -1,4 +1,5 @@
 # Copyright 2021 (c) Anna Schumaker.
+from . import icons
 from . import window
 from gi.repository import Gtk
 
diff --git a/ui/icons.py b/ui/icons.py
index c75c190..85c3e09 100644
--- a/ui/icons.py
+++ b/ui/icons.py
@@ -1 +1,14 @@
 # Copyright 2021 (c) Anna Schumaker.
+from . import window
+from lib import version
+from gi.repository import Gtk
+import pathlib
+
+IconPath = pathlib.Path("data/").absolute()
+
+if version.DEBUG == True:
+    Display = window.Window.get_display()
+    Theme = Gtk.IconTheme.get_for_display(Display)
+
+    paths = Theme.get_search_path()
+    Theme.set_search_path([ str(IconPath) ] + paths)
diff --git a/ui/test_icons.py b/ui/test_icons.py
index c75c190..28f608e 100644
--- a/ui/test_icons.py
+++ b/ui/test_icons.py
@@ -1 +1,20 @@
 # Copyright 2021 (c) Anna Schumaker.
+from . import icons
+from . import window
+from gi.repository import Gdk, Gtk
+import pathlib
+import unittest
+
+Path = pathlib.Path("./data").absolute()
+
+class TestUIIcons(unittest.TestCase):
+    def test_icons(self):
+        self.assertIsInstance(icons.Display, Gdk.Display)
+        self.assertIsInstance(icons.Theme, Gtk.IconTheme)
+
+        self.assertEqual(icons.Display, window.Window.get_display())
+        self.assertEqual(icons.Theme, Gtk.IconTheme.get_for_display(icons.Display))
+        self.assertEqual(icons.IconPath, Path)
+
+        self.assertIn(str(Path), icons.Theme.get_search_path())
+        self.assertTrue(icons.Theme.has_icon("emmental"))