LeapMotion paint program in Haskell.
Use the keys a/z/s/x/d/c/f/v to change the foreground color, q/w/e to change the tool, r to add drops, and g/b to rotate the pictures, h/n for psychedelic rotation, t for kaleidoscope mirroring, i to clear the surface and p to share the picture on twitter (needs some OAUTH and Twitter app env variables, see Twitter Conduit for instructions).