> How on earth do you draw something like that? 

Here's a good starting point...

plane{ z 2
    pigment {
      spherical
      color_map {
        [ 0.2   color rgb <0.2,0.5,0.05> ]
        [ 0.3   color rgb <0.1,0.4,0.05> ]
        [ 0.3   color rgb <0.15,0.6,0.02> ]
        [ 0.33  color rgb <0.05,0.2,0> ]
      }
      
      scale 3.0
      warp { turbulence 0.5 lambda 1.5 omega 0.3 }
    }
    
    finish{ambient 1}
}

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