I came across this awesome design for DM's. It can be added on phone cases, t-shirts, and basically everything in between. I thought I would share in case anyone else wanted to check it out.
http://www.zazzle.com/my/products/public?ps=24&st=date_created&dp=0&cg=0&qs=dungeon%20master&sr=250548725113285143&pg=3