See the UI mockups on [https://docs.google.com/View?id=dd4z8wsd_393dd5v2mdg the original design concept].

Some other ideas:
 * [wiki:Shell/UIConcepts/HomeScreen Home Screen]
 * [wiki:Shell/UIConcepts/TiledWindowManager Tiled Window Manager]
 * [wiki:Shell/UIConcepts/SplitScreen Split Screen]