For those who like blacklights, my local Big Lots (Pic 'n Save in some areas) has a 12" GE blacklight fixture for $4.00. It takes 8 AA batteries, which by my math is 12 volts, which means it should easily hack to a PC power supply. I bought one and verified that it's a true UV lamp and not just a purple bulb. Being a huge fan of TRON, I'm thinking of putting it at the back of my CP like TRON's is and labelling my controls with UV-reactive ink, since my family likes to play with the game-room lights off.
You can't really see it, but there's a round clear plastic shell over the bulb; some of the fixtures I was looking at had the bare bulb exposed.