lucrative for us) to make them ourselves. CafePress won't print on your shirts, their hoodies are crap, and it takes too long from them, among other issues.
Our solution was much better for us in the end since we could use whatever brand clothing we wanted and add to it if there was already a design on it. Any asshole can design a shirt and have it made, but it takes a special asshole to design and make a shirt himself.
We also only started doing it because I wanted my "I hate people" shirt in the worst way, and was drunk enough at the time to think making it myself was a good idea. Didn't hurt that my ex-roomie's mother was an art teacher and had everything we needed laying around. We actually never meant to get into making shirts for other people, but the money was great for doing next-to-nothing.