Cool Tiles is a customization app for Windows Phone that lets you create your own live tiles.
You can tweak all aspects of the screen's appearance with Cool Tiles. You can create icons, map them to apps, then pin them to the start screen. The possibilities of what can be done with Cool Tiles are huge, but the app needs more icon support to be truly great.
Cool Tiles is well worth experimenting with, and one day it could become the best tile customization application for Windows Phone.