Fun way to Kill some Time: Design your own bike!
Passed by this website a few weeks ago. Although I no longer ride fixed gears, nor am I hip - it's still a really fun way to design some ridiculous looking bikes. I spent some time on it and I actually made a jersey design that I'll be wearing this year when I race.
for some truly utterly ridiculously stupid designs that some of my buddies and i did, check this site: