Mine is nothing, try the original program from Robert Alsing. He already released the source code and binaries:

http://rogeralsing.com/2008/12/11/genetic-programming-mona-l...

From what I have seen, he is doing extra type of mutations that I was too lazy to implement: move polygons in the stack (in addition to changing colors and moving points around).

Also how you do mutations matters: it seems smaller deltas are better, though they shouldn't be too small.