I like to hand-code POV-Ray scenes and think there should be more visual references and advanced tutorials for the POV-Ray SDL.
A few people have posted visual POV-Ray references.
O p e n W i k i - POV-Ray Wiki
Portfolio–The standard POV-Ray portfolio rendered
Christoph's page - crackle form parameters
Christoph's page - crackle metricoffset parameters
There are a few tutorials around.
So far, I've posted one and have some under development.
These are resources available to render POV-Ray scenes.