My Sketch

var step = 0.09;

​

function setup() {

  createCanvas(400, 400);

}

​

function draw() {

  background(220);

  for(var i = 0; i < 64; i++){

    for(var j =0; j<32; j++){

      noStroke();

      fill(map(noise(step+i/150,step+j/150),0,1,0,255),

           map(noise(step+i/100,step+j/100),0,1,0,255),

           map(noise(step*2),0,1,0,255))

      rect(i,j,1,1);

    }

  }

  step += 0.01;

}