noFill();

​

  // make a canvas

  let canvasSize = 750

  createCanvas(canvasSize, canvasSize);

​

  // setting colour variables

  stroke(200); // grey stroke around the rects

​

  // setting brick height

  var brickHeight = 15;

​

  // looping vertically

  for (var i = 0; i < canvasSize; i += brickHeight) {

    progress = 0; // tracking if end of line is reached

​

    // looping horizontally

    while (progress < 800) {

​

      fill(random(190, 200), // red

        random(80, 90), // green

        84); // blue

​

      brickWidth = random(20, 40); // random brick width

      rect(progress, i, brickWidth, brickHeight); // draw a rect

      progress += brickWidth; // add the width to progress

    }

  }

}