let size = 10;

function setup() {

  createCanvas(400, 400);

  rectMode(CENTER);

  noStroke();

}

​

function draw() {

  background(255);

​

  for (let i=size/2; i<=height; i+=size){

    for (let j=size/2; j<=width; j+=size){

      let d = noise(j / 100, i / 100, n);

      fill(lerpColor(color(0, 255, 0), color(0, 0, 255), d))

      rect(j, i, size)

      //ellipse(j, i, abs(d));

    }

    vertex(width, height);

    endShape(CLOSE);

  }

  n += 0.01;

}