Embedded Iteration + Randomness

mySketch
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// Starter Code for "Embedded Iteration + Randomness"
var boolDoRefresh;
 
function setup() {
  createCanvas(400, 400);
  background(20,20,50)
  noStroke();
  boolDoRefresh = true;
}
 
function draw() {
  if (boolDoRefresh) {
    // DRAW STUFF HERE....
    boolDoRefresh = false;
    background(20,20,50)
    for (var x = 35; x <= width - 30; x += 30) {
      for (var y = 35; y <= height - 30; y += 30) {
        var rando = random(5);
        if(rando > 1) {
          fill(255,250,150);
          rect(x-13, y-13, 26, 26);
          fill(20,20,50);
          rect(x-10, y-10, 20, 20);
          fill(255,250,150);
          rect(x-5, y-5, 10, 10);
        }
        else {
          fill(20,20,50);
          rect(x-13, y-13, 26, 26);
          fill(255,250,150);
          rect(x-10, y-10, 20, 20);
          fill(20,20,50);
          rect(x-5, y-5, 10, 10);
        }
    }
  }
  }
}
 
function mousePressed() {
  boolDoRefresh = true;
}