Corel Painter IX
More fiddling around with Painter, specifically with its impasto brush effects, and (below) its nifty mosaic creation capability.
The mosaic thingy is only likely to be useful in very rare circumstances, but if you ever actually need to create a mosaic-like image, it's just the bees knees. Actually working it isn't entirely intuitive, but it's not difficult once you become accustomed to the peculiarities of the UI.