Patriotic Punch ~ Red fruit punch on the bottom, blue Gatorade in the middle, diet 7-up or sprite on top! The drink with the highest sugar content stays on the bottom. The drinks won't mix as along as you don't shake the punch bowl.
Possible economical DIY for the wedding? Not to mention they'd double as emergency candles after. Make your own candles for less than 2 dollars a piece. you can even add scents and color. All natural soy.