In the 1990's Atari released a CD add on for its Atari Jaguar cartridge system. It had a really trippy Virtual Light Machine that Jeff Minter created. Basically it reacted to music similar to how the Live Wallpaper Spectrum does only much cooler. This would make a crazy Live Wallpaper. Check it out on youtube. http://www.youtube.com/watch?v=zp0OX7EZsDs