I followed this tutorial on the blog Just Another Day in Paradise to make a Chicks Dig Me T-Shirt. I made it with a freezer paper stencil and Tulip Slick fabric paint. I think the paint is supposed to be for a puff paint look, but it works well for this kind of design. Since it's yellow on white, I also decided to paint in the words so they are easier to read.
I've made a couple of freezer paper stencil shirts before.
Here's a flying pig that my daughter loved. It was made with Tulip brand sparkle paint.