As a follow up after buying a book on asian ink painting (you can check Asian Ink Painting on Amazon's catalog for one that suits you), I installed Asian Paintings (author link) on my iPod Touch. I will probably write a complete review sometime soon, as for now, you can see two paintings I have done.
TouchTerm Pro: ssh for the iTouch
Canabalt for iPhone
Why I bought an iPod touch (as mathematician)
iHold: an iPod touch credit card stand
Field Goal: iPhone/iPod Touch game review
Backbreaker for iPhone/iPod review
Trundle iPod / iPhone game review