Play around with decorating the game tiles.

justcheckers/app.py

@@ -65,7 +65,11 @@ class GameBoard(GridLayout):
                     source = 'non_play'
                 elif row % 2 == 1 and col % 2 == 1:
                     source = 'non_play'
-                self.add_widget(Image(source='images/{}.png'.format(source), allow_stretch=True))
+                self.add_widget(GameTile(source='images/{}.png'.format(source)))
+
+
+class GameTile(Image):
+    pass
 
 
 def log_system_and_game_info():

justcheckers/justcheckers.kv

@@ -160,3 +160,14 @@ ScreenManager:
     row_default_height: 50
     col_force_default: True
     col_default_width: 50
+
+
+<GameTile@Image>:
+    source: "images/play.png"
+    allow_stretch: True
+    canvas.after:
+        Color:
+            rgba: [0, 1, 1, 0.75]
+        Ellipse:
+            pos: self.pos
+            size: self.width - 5, self.height / 2