I was reading some articles about Google Nexus One vs HTC Desire to see what people thought about HTC Sense on a device as powerful as the Nexus One when someone mentioned the website GelaSkins.
This is SO tempting (I'll have to do a proper image as this was just a very quick mock up to test it out)
Having customisation like this is godly for a high-end phone. Certianly makes it stand out of the crowd and couldn't mistake it for anyone elses!