function setup() {

  createCanvas(400, 400);

}

​

function draw() {

  background(0);

  stroke(2);

  for (let i = 20; i < width-4; i+=30) 

  for (let j = 20; j < height+5; j +=30){  

  //fill (60, 0, 150);

  //ellipse (j, i, 15, 15);

      fill (90, 185, 75);

  ellipse (i, j, 25, 25);

    fill (70, 15, 115);

  ellipse (i, j, 20, 15);

    fill (180, 55, 75);

  ellipse (i, j, 10, 10);

  }

}