Although this may appear to be just a photograph or an image-map, it is in
fact a 2D gradient applied to a sky-sphere with a little turbulence thrown
in.

After taking a photograph of a particularly striking sunset, I knocked a bit
of Mega-POV code to sample the image and reproduce it in terms of a 2D
gradient pattern pigment. The sampling was, in this case, also slightly
turbulent.

This image-based method has the advantage of being able to control the depth
of sampling and avoid the pixelated look derived from low-res image-maps.

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Symmetry is wrong:
http://www.imbjr.com

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