Escher Sketch
Awesome! I tried making something like this a few months ago[1] but never got around to finishing it (tiling is busted and performance is pretty terrible): <a href="http://lou.wtf/patturn/" rel="nofollow">http://lou.wtf/patturn/</a><p>Wallpaper groups are really neat. I especially love the p3 and p6 groups.