I think I haven't. At the beginning of last year, I got a notion to start designing images for t-shirts, etc. I just went crazy coming up with ideas, of which some have been designed, and others... not so much. I have been feeling the urge to start working on some of the others, though, so I'll have more soon. I actually have an online shop that's doing pretty well, which you can see here:
Here are a few of my favorites. They're mostly for kids' and babies' t-shirts, although the last one is obviously for a woman, and I thought the munchkin design would be cutest on a bib.