So I went ahead and put my MuppetLock art on a t-shirt for 221B con. My printer lost a little steam on the back, so there are a few skipped lines, but I'm happy with the rough look. It seems very fannish. Can't wait to wear it, and I sort of wonder what it would look like printed professionally.
Here's the front of the t-shirt.
And there's the back of the shirt.