Oh my gosh, I totally forgot about that show. I hope it works out for you. There is a lot of DIY led light stuff out there, and Target now sells a heaping of LED christmas lights. Not sure if those are reusable, but for the prices after the holiday markdowns, they might be worth it.
I think the idea of the pixel pics would be great. You could cut a picture approximately half the size of a keyboard into key size mini-pics, paint the keyboard all black, and glue the little pics on each key. I think it would look neat.