I was just browsing for the Philips amBX speaker solution (basically an ambilight solution for the pc, which I btw found out is hideously expensive) when I stumbled over this cool do-it-yourself project for next winter (a backlit livingroom wallmount for your lcd/plasma), have a look at;
http://www.avforums.com/forums/showthread.php?p=6954036
for a demo on the more expensive buy-it-ready amBX solution for your pc, visit youtube;