I've just finished the 'view from orbit' picture I've been working on 
for the last month.  I didn't really use realistic cloud shapes, but 
used my camera's vantage point to try and fake some descent clouds using 
a marble pattern with a bozo pattern in a pigment_map.
I'll be posting the image on my website when I get a few moments.
http://website.lineone.net/~sacrofts/home.htm
Actually I just finished the image this evening, so give me a day or to 
:-)
Below is the code I used for my cloud layers, hope it's of use!

---code
#declare Altocumulus = 
   texture {
      pigment{marble scallop_wave
      turbulence 0.8 octaves 9
         scale 2000 rotate z*-35 rotate y*-9
         pigment_map{
            [0.0 bozo turbulence 0.25 scale 0.01 color_map{
               [0.0 rgbt 1]
               [0.4 rgb 0 ]
               [1.0 rgb 0 ]}
              ]
            [0.02 bozo scale 0.01 color_map{
               [0.0 rgbt 1]
               [0.4 rgb 0 ]
               [1.0 rgb 0 ]}
              ]
            [0.2 bozo turbulence 0.5 scale 0.01 color_map{
               [0.0 rgbt 1]
               [0.7 rgb 0 ]
               [1.0 rgb 0 ]}
              ]          
            [0.85 rgbt 1]
            [1.0 rgbt 1]
         }
      }
   }

#declare Altocumulus2 =
   texture {
      pigment{marble scallop_wave
         turbulence 0.8 octaves 9
         scale 2000 rotate z*-35 rotate y*-9
         pigment_map{
            [0.0 bozo turbulence 0.25 scale 0.009 color_map{
               [0.0 rgbt 1]
               [0.4 rgb 1 ]
               [1.0 rgb 1 ]}
              ]
            [0.02 bozo scale 0.01 color_map{
               [0.0 rgbt 1]
               [0.4 rgb 1 ]
               [1.0 rgb 1 ]}
              ]
            [0.2 bozo turbulence 0.5 scale 0.009 color_map{
               [0.0 rgbt 1]
               [0.7 rgb 1 ]
               [1.0 rgb 1 ]}
              ]
            [0.85 rgbt 1]
            [1.0 rgbt 1]
         }
      }
   }

#declare Stratus =
   texture{
      pigment{ gradient x
         pigment_map{
            [0.42 color rgbt 1]
            [0.45 wrinkles rotate z*45 frequency 25 scale <1,5,1> 
color_map{
               [0.29 rgbt 1]
               [0.3 rgbt <1,1,1,0.2>]
               [0.5 rgbt <1,1,1,0.2>]
               [0.56 rgbt 1]
               [1.0 rgbt 1]} ] 
            [0.55 wrinkles rotate z*45 frequency 25 scale <1,5,1> 
color_map{
               [0.29 rgbt 1]
               [0.3 rgbt <1,1,1,0.2>]
               [0.5 rgbt <1,1,1,0.2>]
               [0.56 rgbt 1]
               [1.0 rgbt 1]} ]  
            [0.56 color rgbt 1]}
            scale <1000,1000,1000> rotate <0,23,60> turbulence 0.25 
octaves 10}
            
      pigment{ granite  rotate <-6,-20,0>
         color_map{
            [0.0 rgbt 1]
            [0.2 rgbt 1]
            [0.5 rgb 1]
            [0.8 rgbt 1]
            [1.0 rgbt 1]}
         }
     }

sphere {0,7977    
   texture {Stratus}
   } 
   
sphere {0, 7969   
   texture {Altocumulus }
   texture {Altocumulus2 rotate x*-0.02 }
   }

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