Like many other people, my frist true love was Jessica Rabit.
How it's done: http://youtube.com/watch?v=r940y3N1Yns
I was just browsing through the many pages of the internet when i stumbled across a picture of Jessica Rabit "untooned". I later found a blog called pixeloo which has some really cool photoshop work on it. I've seen other photoshop "speed painting" before, but I really liked how pixeloo uses images from existing photos and picks them apart and morphs them into the desired shapes.