Mike, thanks for tutorials.
A axample:

sky_sphere {

  pigment {
    gradient y
    color_map {
        [  0/269 color rgb <120/255, 79/255, 51/255>]
        [  1/269 color rgb <141/255, 83/255, 46/255>]
        [  2/269 color rgb <177/255, 86/255, 41/255>]
        [  3/269 color rgb <235/255,128/255, 72/255>]
        [  5/269 color rgb <255/255,159/255, 72/255>]
        [  8/269 color rgb <255/255,203/255, 94/255>] // New
        [ 10/269 color rgb <255/255,218/255,112/255>]
        [ 13/269 color rgb <255/255,233/255,148/255>] // New
        [ 15/269 color rgb <251/255,241/255,172/255>] // New
        [ 20/269 color rgb <255/255,246/255,203/255>]
        [ 30/269 color rgb <255/255,240/255,219/255>]
        [ 40/269 color rgb <236/255,223/255,214/255>]
        [ 50/269 color rgb <205/255,204/255,212/255>]
        [ 55/269 color rgb <185/255,190/255,209/255>] // New
        [ 60/269 color rgb <166/255,176/255,201/255>]
        [ 65/269 color rgb <149/255,163/255,190/255>] // New
        [ 70/269 color rgb <129/255,149/255,182/255>]
        [ 80/269 color rgb <103/255,127/255,171/255>]
        [ 90/269 color rgb < 79/255,110/255,154/255>]
        [100/269 color rgb < 66/255, 97/255,143/255>]
        [110/269 color rgb < 52/255, 84/255,131/255>]
        [120/269 color rgb < 47/255, 75/255,122/255>]
        [140/269 color rgb < 37/255, 60/255,102/255>]
        [160/269 color rgb < 32/255, 51/255, 84/255>]
        [180/269 color rgb < 27/255, 42/255, 71/255>]
        [200/269 color rgb < 25/255, 36/255, 58/255>]
        [220/269 color rgb < 22/255, 31/255, 48/255>]
        [240/269 color rgb < 18/255, 27/255, 42/255>]
        [260/269 color rgb < 15/255, 21/255, 33/255>]
        [269/269 color rgb < 15/255, 21/255, 33/255>]

    }
    scale 0.5
  }


    pigment {
      bozo
      turbulence 0.65
      octaves 6
      omega 0.7
      lambda 2
      color_map {
          [0.0 0.1 color rgb <0.85, 0.85, 0.85>
                   color rgb <0.75, 0.75, 0.75>]
          [0.1 0.5 color rgb <0.75, 0.75, 0.75>
                   color rgbt <1, 1, 1, 1>]
          [0.5 1.0 color rgbt <1, 1, 1, 1>
                   color rgbt <1, 1, 1, 1>]
      }
      scale <0.2, 0.5, 0.2>


    scale 0.6
    rotate -90*x
    rotate -90*z
    }

}




plane {
  y, 0
  texture {
    pigment {
      checker
      color rgb <0.0, 0.1, 0.1>
      color rgb <0.0, 0.0, 0.0>
      scale 2
    }
  }

}

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