Use Harmonious, the smart sketchpad.
Harmonious is a smart sketchpad that helps anyone quickly create works-of-art and upload them for the world to see. It is based on the Harmony drawing tool from Mr Doob and uses PhoneGap, jQTouch and the Glyphish icon set.
This technique of drawing is so well suited to the touch interface that Apple featured Harmonious on the front page of the App Store for a month shortly after it was released.
The sketch below is from one of the top users of the accompanying gallery site
