I just saw this on Mashable on thought it was worth a repost. It's incredible what Kyle Lambert is able to do with the iPad. I was never into finger-painting, but this is pretty awesome.
Painted by Kyle Lambert www.kylelambert.co.uk The world's most realistic finger painting. Using only a finger, an iPad Air and the app Procreate, artist Kyle Lambert has painted a photorealistic portrait of actor Morgan Freeman. Original Photograph Taken by Scott Gries - http://www.scottgries.com Music by Richard Woolgar