I would do it this way (untested code):

#declare pig=pigment {
      pigment_pattern {
            checker
            <0,0,0>
            <1,1,1>
            warp { turbulence 0.2}
      }
      pigment_map {
            [0 pig1]
            [1 pig2]
      }
}

 - Slime
 [ http://www.slimeland.com/ ]

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