For those who may be interested in the combination graphic programming \ evolution , I quote a couple of simulations which have been proposed by mr Dawkins in his books

The spider net

Primitive spiders are moving randomly on the screen , leaving a drool behind them
You blit randomly some circles on the screen, the flyers
You count the number of circles overlapping with the spider net, using this number as "fit" factor for the genetic evolution
After many generations the virtual spider will behave like a real spider

The evolution of the crystalline lens of eyes

You get started from a shapeless sac full of liquid and some point lights
you draw the immagine of the light sources on a screen
The rays start from the point lights and reach the screen passing through the crystalline
You modifiy its shape using as "fit" parameter the average distance of the images of the same light
All the rays coming from the same light should converge in the same point on the screen to have a clear image
The shapeless sac will slowly turn into a lens

As as I know the graphic simulation of the evolution of the eye, not only the crystaline, has been made
The results were impressive
You dont need, relativly speaking, so many generation
This match the fossil evidences
Eyes popped up