Stuffed Pizza Muffins- these are awesome! I use shredded mozzarella rather than chunks of string cheese. How in the hell would you neatly roll THOSE up? Also, we call them pizza rolls b/c pizza cupcakes sounds stupid and revolting.
Cannella Vita: cookies n' creme cupcakes - with a whole Oreo cookie baked into the bottom! The cookie stays firm and crunchy, which makes it interesting to eat against the soft, moist cake, but it gives the whole thing a really lovely crunch.