Since installing the Brushes application I can't stop playing around with it, sketching random things. It's a super simple program that lets you paint with your fingers on the iPhone. But it just got better as I discovered you can use the free Brushes viewer that tracks every single stroke of your painting so you convert it into a movie. Here's the time lapse of my first effort, Spikey the cactus.
Have a look at the finished painting.