A very simple pattern,
play with the blob thresholds to get fifferent patterns

ingo

---%<------%<------%<---
// Persistence of Vision Ray Tracer Scene Description File
// File: schakels.pov
// Vers: 3.7
// Desc: tiled pigment_pattern based on two blobs
// Date: 2019-01-14
// Auth: Ingo Janssen

#version 3.7;

global_settings {assumed_gamma 1}

camera {
  location <0,0,-12> look_at 0
  right x*image_width/image_height
}

//thresholds: 
#declare A=.65; #declare B=.65; #declare C=.65; #declare D=.65;
//#declare A=.75; #declare B=.45; #declare C=.65; #declare D=.65;
//#declare A=.45; #declare B=.45; #declare C=.85; #declare D=.85;
//#declare A=.65; #declare B=.85; #declare C=.85; #declare D=.65;
//#declare A=.55; #declare B=.55; #declare C=.55; #declare D=.55;
//#declare A=.75; #declare B=.75; #declare C=.55; #declare D=.55;
//#declare A=.65; #declare B=.45; #declare C=.85; #declare D=.3;

#declare P= pigment {
  pigment_pattern {
    object {
      union {
        blob {
          threshold A
          sphere {<.25,0.2,0>,.4,1}
          sphere {<.75,0.2,0>,.4,1}
        }
        blob {
          threshold B
          sphere {<.5,0.5,0>,.4,1}
          sphere {<.5,1.0,0>,.4,1}
        }
        blob {
          threshold C
          sphere {<.25,0.2,0>,.4,1}
          sphere {<.75,0.2,0>,.4,1}
          translate <0.55,0.55,0>
        }
        blob {
          threshold D
          sphere {<.5,0.5,0>,.4,1}
          sphere {<.5,1.0,0>,.4,1}
          translate <0.55,-0.55,0>
        }
        translate <-0.5,-0.2>
        scale <1/0.55,1/0.55,1>
      }
    }
    warp {repeat x flip x}
    warp {repeat y flip y}
  }
}

plane {
  z,0
  pigment {
    P
    pigment_map {
      [0.5, rgb 0]
      [0.5, rgb 1]
    }
  }
  finish {ambient 1}
}

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