Example of a drawing tool of mine that lets you save/share via URL: http://wry.me/hacking/flake.html http://wry.me/hacking/flake.html (I'd paste in the example

Example of a drawing tool of mine that lets you save/share via URL: http://wry.me/hacking/flake.html http://wry.me/hacking/flake.html (I'd paste in the example of a Christmas tree a friend drew, except it's, uh... a lot. But the source code might help as a starting point. The OP's URLs wouldn't be as huge since it has a much coarser grid.)