Not exactly a game but a fun time waster that can produce some nice results. I'll admit that I prefer ArtRage but this does some things better. https://itunes.apple.com/us/app/inspire-pro-painting-drawing/id355460798?mt=8
App info is currently processing and/or the app is not yet fully available for sale on the US App Store. This seems to have lots of good reviews actually.
App info is currently processing and/or the app is not yet fully available for sale on the US App Store.