size(300,300);
  background(0);
  noStroke();
  smooth();

for (float a = random(33); a < 300; a += random(33,66)) {
  for (float b = random(267,300); b > 1; b -= random(33,66)) {
    fill(a,30);
    arc(a, a, b%a, b%a, PI, TWO_PI);
    arc(b, b, a%b, a%b, TWO_PI-PI/2, PI/2);

   }
}