Before I go, I quickly just wanted to ask about live wallpapers. Do you guys like them? The high quality ones seem to do very well in the android market.
Like anything else in the mobile world - these are probably a crapshoot. For every 1 wallpaper that is successful there is probably 1,000 that fail. Make sure if you try to make one of these to make it cheap as a test. If it works out, pursue making a better one. Once again, don't bet all your chips on one thing.