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This method works great, I've been doing it onto shirts for a while. Take a look at Doitup's pictures if you want to see how it comes out.
Print the design onto a sheet of overhead paper (clear plastic stuff), then cut out your graphic with an exacto knife. Now you have a stencil. Tape the stencil onto wherever you want it. Buy some fabric paint and apply it to your shirt with a sponge, by dabbing onto the fabric. Be sure to put some cardboard inside the shirt and be careful with the paint, and other than that no problems! Good luck.