Making t-shirts is hard work — first you need a great design, then you need to learn how to screen print, and we haven't even gotten to the whole selling part. The good people at Cotton Bureau T-Shirts ($20) have taken the trouble out of making and selling a great shirt, letting designers focus on what they're good at — designing. The concept is simple. Designers submit a design and it has two weeks to generate 25 sales. If it does so, it gets sold — if not, it doesn't. The shirts are printed in limited runs, so the odds of one of your buddies showing up in the same one are pretty slim.