Museum of Color

Used simulated annealing to minimize: (neighbor pixel color distance)^2 + Const (color distance to the target)^2 where I used Const = 4. The method works best for Seurat portrait for obvious reason, and worst for Rubens (my apology for desecrating his work).

Some preliminary article on the method I used is here: http://d.hatena.ne.jp/ita/20100222/p1

All original images are from wikimedia commons. From left to right, top to bottom: Gogh, Gauguin, Miro, Monet, Seurat, Cezanne, Hokusai, Leonardo da Vinci, Mucha, Chagall, Manet, Renoir, Rubens, Dali, Millet, Picasso, Seurat.