Felix schaber and Horst Jens are building a series on using Genetic Algorithms with Python and xturtle to breed interesting pictures. The title is Python: xturtle, random und genetischer Algorithmus.
The series is in German (with English subtitles) and builds upon a previous series:
dies ist die deutsche Übersetzung der englischen Video-Tutorial-Serie create art with xturtle and random
Related posts:
The previous series is in English with English subtitles. See:
http://www.showmedo.com/videos/series?name=jdb1dPCrc
for the video series and http://wiki.showmedo.com/index.php/Python_xturtle_random_en for the Wiki (including source code)