DIY: ombre t-shirt (make your own). Might also be cool to try taping or covering a section of the shirt in a pattern/design and then removing the tape after spraying so that you get a really cool imprint on the shirt. Dont know if it will work or not though... just a thought
Trace a design on a plain tee-shirt with water-soluble glue such as Elmer's. Follow instructions on your choice of hot water dye. Once finished and the dye has set, then soak in warm water until glue dissolves and design will look beautiful!