iPhone app: Brushes

iPhone app : Brushes

"Brushes is a natural media painting application designed from scratch for the iPhone and iPod touch. Featuring an advanced color picker, several realistic brushes, extreme zooming, and a simple yet deep interface, it is a powerful tool for creating original artwork on your mobile device.

Brushes allows you to choose any color (including transparency) using the hue/saturation color wheel. With virtually unlimited undo and redo you never need to worry about making a mistake or backing up too far."

http://brushesapp.com/

See some of the sketches here