createCanvas(400, 400);

  background(255, 255, 255);

  strokeWeight(5);

  stroke(255,255,255);

  let brickWidth = 50;

  let brickHeight = 20;

  for (let y = 0; y <= height; y += brickHeight) {

    for (let x = 0; x <= width; x += brickWidth) {

      fill(128, random(0, 100), random(0, 100));

      if (y % (2 * brickHeight) == 0) { // Even rows: starting from x = 0

        rect(x, y, brickWidth, brickHeight);

      } else { // Odd rows: starting from x = -brickWidth/2

        rect(x - brickWidth / 2, y, brickWidth, brickHeight);

      }

    }

  }

}

​

function draw() {

}