This was actually fairly simple to do. I generated a bunch of points in 
an array, and used an image_map pigment function to extract the colors 
at each point and save them as colors in a color_map. Then, for the 
voronoi pattern, I just used the points with their respective color_map 
indices, basically using the color map as the palette of an indexed 
color image.

Oh, and there's 5000 points in this image. With all 5000 entries in one 
color_map. Some of you might notice something interesting about that...
I needed to store a lot of colors, but didn't want to go through the 
trouble of building nested color_maps or trying to reduce the number of 
colors used, so I patched POV to remove the size limits on blend maps. 
;-)

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