try this:

sky_sphere {
   pigment {
     pigment_pattern {granite scale 3}
     pigment_map {
       [0
         crackle form <1,1,0>
         scale .0035
         color_map {
           [.35 rgb .25]
           [.55 rgb 0]
         }
       ]
       [1 rgb 0]
     }
     poly_wave .25
   }
}


it's old code, haven't tested it with any recent version of POV-Ray, but 
I suppose it'll still work.

cu!
-- 
ZK

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