Sunbeam Chameleon
 

I think Sunbeam has a real winner on its hands with the Chameleon! Not only can you set the color to your liking, but the four individual LED cannon lights let you focus the lighting exactly where you want it inside of your case. The Chameleon is also a pretty good lighting deal price-wise at $22.99 from FrozenCPU.com, too.
URLs:
Review / Article: http://www.lanaddict.com/rev/144/1/