The lid needs a camera and the wallpaper needs to update every ten seconds or something. That'd be awesome. but it'd be difficult to reproduce the lighting...ok, a light-detector-thingey on the front. that would be cool.

I've done it before. Much more impressive with a 1.5 ft. deep CRT and if you don't move your head around too much. :)

Like Caleb said, this is all less impressive if the light changes too much. But if you're in an area with only artificial lighting, I guess you're okay.