function setup() {

  createCanvas(windowWidth,

               windowHeight);

  background(234, 234, 234);

}



function draw() {

  var from = color(100, 0 , 0, 20);

  var to = color(0, 100, 50, 20);



  stroke(255, 170);

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

  ellipse(random(width), random(height), 150, 150);

}