Tacky glue, and some fabric paint. I mixed a silvery glitter with a blue to come up with an "ice blue," and a sponge (sponge brush or clean dish sponge).
Allow to dry completely. I left it overnight. Soak the shirt in warm water till the glue softens (10mins) then peel it off!
Stay tuned. I'm gonna do a post about an awesome project Meaghan over at I Kicked Cancer's @ss is doing.