Amazing free software

Just found an amazing fun bit of free software, thanks to Wally Torta's wonderful illustrated blog. You can produce pictures in oils, crayons, pencils, and felt tips with none of the mess. It's free to download for both the Mac and Windows. I created this fairly horrible picture in next to no time. The only obvious constraint seems to be the size, so you can't produce huge pictures at 300 pixels per inch.