ToonPaint: When you first use ToonPaint, it feels like you're using an adjustable photo filter, and not much more. Then, you start painting. I'll let the video explain this one.

As someone who can't draw an even circle, let alone a convincing portrait, I can vouch for this one. Brutally unartistic people: Remember how you felt when you used to trace cartoons as a kid? This is like that, again, on your iPhone. $2.