Cupcake Frosting

What is your favorite type of cupcake frosting? Buttercream, whipped cream, ganache, etc?

When I was in Jr. High, I used Crisco exclusively for frosting the cakes I used to make my classmates on an almost weekly basis (I think my parents didn't want to spend that much money on butter), which I have a terribly hard time believing, but I was raised on more of a margarine diet for part of my life and it stuck until I discovered the real deal. Now, I'm almost a buttercream snob...but I'm working on branching out for these experiments.

So tell me, what do YOU like?