I found the demo trees a bit lacking, so I made some with more recursiveness and better fitting near the joints. Fibonacci rarely looked so cool.
Second order recursion can give you some interesting stuff. At some point I was successful in drawing a galaxy but things went whacky
I could see myself readily using this to generate artwork or material texture in some game.
This thing desperately needs some more love than shown in the video. I'm dying to export data, be able to remove elements from left and right sidebars, have more basic shapes (triangle?), a persistent shape library (html5 local storage?), and some form of snapping to grid/angles/ratio/edge.