Sure, you can go to Coldstone Creamery and watch the hig school kid back there behind the marble slab "create your own flavor," but how creative is it to add miniature gummy bears to vanilla ice cream?
Chicago based company eCreamery allows you to choose from three base mixes based on fat content: 8% is gelato, 12% is classic, and 14% is super premium. The bases come in 77 flavors, and by mixing and matching the ice cream base flavors along with other ingredients, you can come up with some very interesting combinations that go beyond graham cracker crumbs. Dill, anyone?
It isn't cheap, but who wouldn't pay $100 bucks for the flavor of the month: Cucumber Dillweed!?