The Old Heathen's Emporium : Just Show Me The Dark T-Shirts, Man
Every black T-shirt I design is listed here, listed simply in alphabetical order -- science-geek designs, mythological designs, and general weirdness designs are all lumped together. For the convenience of those of you who, like me, only wear black because nobody has yet invented anything darker.
Now you can get all these designs on cardinal red, navy blue, or military green T-shirt, as well. Be warned that not all of these designs will necessarily look good on all of these backgrounds.
Happy shopping!