Wet Dream     http://www.levien.com/gimp/wetdream.html     tags: watercolor naturalmedia metacreations An architecure for "natural" brush types in Gimp 1     http://www.levien.com/gimp/brush-arch.html     tags: metacreations patent gimp naturalmedia NYU Media Research Lab | Projects | NPR | Painterly Renderin...     Painterly Rendering     http://www.mrl.nyu.edu/projects/npr/painterly/     tags: naturalmedia Colored Pencil Filter with Custom Colors     http://www.hci.media.yamanashi.ac.jp/~mao/paper/pg04.pdf     tags: chalk naturalmedia