function setup() {

  createCanvas(windowWidth,

               windowHeight);

  background(234, 234, 234);

}



function draw() {

  var from = color(0, 200, 255, 40);

  var to = color(300, 100, 20., 40);



  fill(lerpColor(from, to, random(1.0)));

  rect(random(width), random(height), 50, 50);

}