This is a height_field (multiple actually, tiled, but not tile-able) 
made from a nine* megapixel .png made of course from an orthogonal view 
of crackle pattern pigment on a plane.  The pigment used for the 
height_field is a *different* .png which is basically the original after 
a few bucket-fills in GIMP with different colors to different 'stones.'

I could keep-it-in-POV-Ray (no image based height_fields or image_maps) 
if I knew how to give individual stones different colors using crackle. 
  Unfortunately it looks like there's a choice between patterns that can 
give borders to cells, or patterns which can give different colors to 
different cells.

Any advice?

Thanks!
Charles

PS I'm using 1 unit = 1".  The reference axis arrows are 12" long as is 
the sphere's diameter.

*I was using 36 megapixels earlier but didn't re-do it so the below 
image has seams:

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