http://itunes.apple.com/us/app/genartist/id465643459?ls=1&mt=8
Wanna produce your own distinctive drawings?
This GenArtist App helps you by generating random effects and patterns.
Every time you get a unique image.
User guide:
(1) Touch the screen to draw.
(2) The background pattern would evolve by time.
(3) Shake the device to randomize effects, patterns and colors.
(4) You can also use the “Shake” and “Big Shake” button for the randomization.
(5) “Shake” performs less randomization while “Big shake” performs more.
(6) You can “Snapshot” the image to the photo album.
“Restart” would clear the image. Screenshots: