I'm thinking about carving/cutting out the letters on each of the keys on my keyboard and putting some LEDs in there somewhere. But I don't know if I can pull enough voltage through the PS2 port. Maybe I'll find a way to put some clear/translucent stuff in or behind the holes/letters. Of course I'll have to try this with an old POS first... Any ideas?
EDIT: wait a minute, my keyboard is wireless! LMAO! I guess I'd just have to add another battery and a switch to turn it off.
EDIT: I got the idea after reading this thread.