Here's a nifty little trick from Smart Creative's Tymn Armstrong for designing on transparent materials. Tervis Tumblers now let you design your own wrap for their products, and it's easy to go overboard with colors and patterns. In this case keeping it simple actually creates a super-cool effect when you use white as a single color imprint. When the glass is empty, you still achieve a subtle reveal but add ya' a little diet coke and you get fantastic contrast and a message that really pops. Not too shabby.