Using iPhone app Brushes, artist Jorge Colombo managed to draw a fabulous finger painting of a Times Square scene for the New Yorker magazine.
Of Portuguese origin, since 2003 Jorge Colombo has started working on digital videos, initially restricting himself to one-minute movies, later moving into longer projects. And in 2009 he started also making drawings on an iPhone. (Prints available at www.20×200.com.)

You can actually see how Colombo painted his scene in the video below, recorded using Brushes companion app Brushes Viewer.
via Gizmodo.















I prefer the Etch-A-Sketch. Even lower-tech and better results imho.
http://images.google.nl/images?q=etch+a+sketch&oe=utf-8&rls=org.mozilla:en-US:official&client=firefox-a&um=1&ie=UTF-8&ei=VaUaSqG-A8mw-Aa3yojLDg&sa=X&oi=image_result_group&resnum=4&ct=title