I have wanted to try stenciling on old T-shirts with bleach for awhile now. It is so simple, and quick. All I did was cut stars and words from contact paper using my Sizzix. I placed them on the shirts where I wanted, made sure they were adhered well, put a trash bag inside the t-shirt to protect the back from bleach, and sprayed with a spray mister filled with bleach. The effect was obvious in 1-2 minutes.
Make sure you do this in a well ventilated area, preferably outside, and wear gloves and protective eye wear.
You will love this project. The customizations options are unlimited!