I just finished my first t-shirt yarn project. See t-yarn entry. So here's my rug made in a simple single crochet. I used about 9 or 10 t-shirts and it measures about 18"x30".
It's kind of bright, but I like bright things. The little yellow bits you see in the first red part are bits of Sponge Bob, who once decorated that t-shirt.
I'm going to try another couple of rugs, one in stripes and one in granny squares, and maybe a circular one.
Good night, sleep tight.