You could try this code, changing the colours of the media of course to 
white or very light grey.

//start code
#local SkyScale = 100;

#local Density_out =
density {
   bozo  //agate
   density_map {
     [0.2 rgb 1.0]
     [0.5 rgb 0.2]
     [0.8 rgb 1.0]
   }
   scale 0.05 //0.1
   warp {turbulence <0.5 0.4, 0.5>*2}
}

#local MistSphere =
difference {
   sphere { <0, 0, 0>, 1}
   plane {-y, 0 translate 10/SkyScale*y}
   texture {pigment {rgb 0 transmit 1} }
   hollow
   interior {
     media {
       intervals 1
       absorption <0.10, 0.10, 0.12>
       scattering {1, rgb <1, 1, 0.8>*1.4/SkyScale}
       samples 50
       confidence 0.9999
       variance 1/1000
       ratio 0.9
       density {
         spherical
         density_map {
           [0.880 Density_out]
           [0.960 rgb 0]
         }
       }
     }
   }
   scale SkyScale
   translate CamLoc
}

MistSphere
//end code

-- 
Thomas

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