Yeah, I think Arvin got 2 materials that could be used as an almost final handpainted style, and then people could tweak that idea more. Certainly with the new pixel processor people can try doing something there that could be ideal. I'm still not that far advanced to know how to. But I believe it could be possible.
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The key is... It's really similar to actually painting it. The big difference is that you use the gradient map node to "paint" the texture.
So you would use the light node to set the base layer of paint, then blend it with the ao node, etc.
Each time you run it through a gradient map to apply "paint" to that layer