createCanvas(windowWidth, windowHeight);

    noStroke();

}

​

function draw() {

    for (var x = 0; x < width; x+=3) {

        for (var y = 0; y < height; y+=3) {

            var c = 255 * noise(0.005 * x, 0.005 * y);

            fill(c);

            rect(x, y, 3, 3);

        }       

    }

}