15th

‘Genetic algorithms’ to overlay semi-transparent polygons to replicate images by Roger Alsing; more information and source code on his blog. There is also a java implementation by Pierre Lindenbaun.
Clarification: There is no population and no recombination of DNA. So not a genetic algorithm but a stochastic hill-climber, as pointed out in some of the comments. If was done as a genetic algorithm then it would be a lot fast and should produce better results.
(via via life inspired: Evolution of Figures)