It seems that I caught the bug that is floating around the blogging world. I finally dug out some old t-shirts and tried freezer paper stenciling. I must say that it is a very satisfying craft. It's quick and easy, but looks like you worked harder than you actually did. I did not buy fabric paint because I couldn't find any, not that I was looking hard, I had two little helpers at the craft store and they kept grabbing everything off of the shelves so I found the closest thing I could and got the rock out of dodge. Instead I used a medium that converts acrlyic paint to fabric paint and it seems to be holding up on our t-shirts just fine, though I can't speak for the quality of fabric paint. For a summary of instructions visit Amy at Angry Chicken here. I found most of my stencils by googling specific images and using clipart.
By request, Eli's purple triceratops:
Sadie's bird and tree: My I'm-not-so-impressed-by-this-one t-shirt: A gift for a birthday: