This code illustrates what I mean.  By playing with the texture maps for
TCells1  and  TCells2 you should be able to get sufficient variety?




         #local Tgrout =
         texture {
                 pigment { rgb 1 }
         };
         #local TBlack =
         texture {
                 pigment { rgb 0 }
         };
         #local TRed =
         texture {
                 pigment { rgb Red }
         };
         #local TCyan =
         texture {
                 pigment { rgb Cyan }
         };
         #local TCells1 =
         texture {
                         cells
                         texture_map {
                                 [0 TBlack]
                                 [1 TCyan]
                         }
         };
         #local TCells2 =
         texture {
                         cells
                         texture_map {
                                 [0 TRed]
                                 [1 TCyan]
                         }
         };
         #local T1 =
         texture {
                         gradient x
                         texture_map {
                                 [.05   Tgrout]
                                 [.05   TCells1]
                                 [.95   TCells1]
                                 [.95   Tgrout]
                         }

         };
         #local T2 =
         texture {
                         gradient x
                         texture_map {
                                 [.05   Tgrout]
                                 [.05   TCells2]
                                 [.95   TCells2]
                                 [.95   Tgrout]
                         }
                         translate x*.5
         };

         plane {
                 z, 0

                 texture {

                         gradient y
                         scale .5
                         texture_map {
                                 [.05   Tgrout]
                                 [.05   T1]
                                 [.45   T1]
                                 [.45   Tgrout]
                                 [.55   Tgrout]
                                 [.55   T2]
                                 [.95   T2]
                                 [.95   Tgrout]
                         }


                 }
         }

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