Gin & ____?

My latest quest has involved me mixing Gin with just about any liquid that I can find at my house or in the grocery store. I'm not sure where this thought came from, but for some reason I'm convinced that there is a better mixer for Gin than Tonic Water. It's not that I don't like the classic Gin & tonic...quite the opposite. I think it's a great drink. It's sophisticated enough to be ordered when you're with your boss, but not pretentious enough (see: scotch et. al) to be mocked by your peers. In addition to these great attributes, the Gin & Tonic also has a great taste. That being said, I feel as if someone created the Gin/Tonic combo and pretty much thought they had it figured out. That's the best we can do...we quit. I'm not convinced. What if we would've quit creating soft drinks after coke and pepsi? What if TV creativity stopped with three networks and a manual knob? If that was the case, how could I spend my evening drinking Berries & Cream Dr. Pepper while watching some southern lady bake some food I can't even pronounce on channel 56? So back to my quest. I've tried just about everything. Part of me thinks that my discovery will be like vasaline or the post-it note...that is, I'll find my perfect mixer while not even looking for it. If you have any ideas, please post comments. Keep in mind that I've already tried everything from: squirt, orange juice, dt. mountain dew, fresca (not proud of that one), beer, chocolate silk soy milk, apple juice, seltzer water, propel, lemonade...