I know you've probably already seen a million or so like this, but I've 
made a procedural starfield using a crackle pattern which I think looks 
pretty convincing, or at least a lot better than my previously used 
modified granite pattern from textures.inc. It was actually really simple 
to make and it's the first time I've found crackle forms useful. It's a 
hell of a lot simpler than a sphere-placing macro and I think the results 
are better. Here's the code:

sphere {
  0, 1
  pigment {
    crackle form <1, 1, 0>
    scale 1/200
    colour_map {
      [0.4 rgb 1]
      [0.6 rgb 0]
    }
  }
  finish {
    diffuse 0
    ambient 1
  }
  inverse
  scale 1000000
}

-- 
light_source#macro G(E)sphere{z+E*y*5e-3.04rotate-z*E*6pigment{rgbt#end{
20*y-10#local n=162;1}#while(n)#local n=n-.3;G(n)x}}G(-n).7}}#end//GregE

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