Three words: Peanut Butter Mocha.
I'm obsessed with all things peanut butter, but for whatever reason (lack of availability, I suppose), I've never had a peanut butter coffee drink.
Good Earth's recipe involves a standard mocha (espresso, steamed milk and mocha sauce) with a packet of good ol' kraft peanut butter blended into the espresso and syrup.
Verdict: amazing. The peanut butter adds a lovely richness and, given that it's heavier than the other ingredients, it tends to settle in the drink making it more peanut buttery as you drink down.