Here’s a great app for drawing pixel art on your iPhone/iPod and iPad.
http://terriblegames.com/spriteSomething/
I highly recommend this. I have been playing with it for hours the last few weeks. It’s really fun and easy to use. It includes a lot o great features for making games. Draw anywhere you have iPhone/iPod and or iPad, at the cafe on the train or on the bus. Draw a quick icon of a beer bottle or martini glass at the pub with your drink as a model! Draw a quick pixel art portrait of your favorite bartender with one hand and your *drink in the other. (I don’t recommend drawing while under the influence of drugs or alcohol. All references to drinks in this article are fruit juice only.)