Voronoi generates 2D Voronoi diagrams of various semi-random sets of points (either disturbed square, hexagonal or triangualar grid, or almost totally random) and knows some nice ways how to color them.
What are Voronoi diagrams
Imagine a finite set of points in some metric space (or just just normal n-dimensional space, if you don't know much about metric spaces). If you now take any point of the space, there definitely exists a point of the set which is closest to this point. This way the set breaks the space to parts, (called cells below) each consisting of points nearest to a one point of the set. This division is what is called Voronoi diagram of the set (roughly).
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