PaintCan is not a painterly effect applied to your image -- you really are the painter! But don't worry, anybody can do it. PaintCan helps you paint, with smart brushes that configure themselves based on the image you are painting on, so that you spend less time configuring settings, and more time exploring your creativity.
PaintCan is still in its infancy and Adobe plans to add new features based on user feedback.
You can download PaintCan from the App Store for free.