OmniSketch was included in a the Digital Trends article The Best iPad Apps!
If your drawing skills fall a bit below that of Jorge Columbo and your aspirations are more whimsical than artistic, try OmniSketch. Like a throwback to the days of Kid Pix, OmniSketch is a procedural drawing program with brushes that pull strange effects as you draw, from crosshatching the spaces between lines to leaving trails of dots that get bigger the faster you draw. Sure, the final pieces will tend toward the abstract, but you’ll have a lot of fun getting there, whether you know what you’re doing or not.
Here’s a link to the full Article.