Rylan Wright describes a compositor technique to achieve a 'painted' effect.
After being inspired by the "painting with polygons" technique about a year ago, I thought about doing a painterly, crayon, or watercolor type rendering with the compositor displace nodes,canvas images and procedural textures.
The rough edges are part of the render when you shift + BKey in camera view and boarder the image. I figured this out by trail and error with just the mind set of "I know Blender could do this."
Here is a tutorial on the node setup if other blender users are interested.