This is a texture by Mike Williams That I like a lot. I keep it in my Moray 
files which explains the code format:

#declare DragonSkin =
   material  // DragonSkin
   {
      texture
      {
         pigment
         {
            crackle form <-1.0, 1.0, 0.0>
            color_map
            {
               [ 0.0     rgbft <0.0, 0.1, 0.0, 0.0, 0.0> ]
               [ 0.1     rgbft <0.3, 0.5, 0.1, 0.0, 0.0> ]
               [ 0.4     rgbft <0.3, 0.4, 0.2, 0.0, 0.0> ]
               [ 1.0     rgbft <0.5, 0.5, 0.1, 0.0, 0.0> ]
            }
            turbulence 0.2
            octaves 2
            ramp_wave
         }
         normal
         {
            crackle form <-1.0, 1.0, 0.0>
            turbulence 0.2
            octaves 2
            ramp_wave
         }
         finish
         {
            ambient 0.0
            phong 0.5
            phong_size 20.0
            specular 0.1
            roughness 0.15
            metallic 0.5
         }
         scale  0.3

         //  Texture by Mike Williams
         //  p.b.i. 04-07-2005

      }
   }

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