size(400,400);
background(0,0,200);

noFill();
stroke(255);

smooth();
ellipseMode(CENTER_DIAMETER);
strokeWeight(5);

float randomness=random(50)+10;
float bigChance=20;

float rad=10;

fill(100,200,255);
for(int i=0; i<10; i++)
  for(int j=0; j<10; j++) {
    rad=10+random(10);
    if(random(100)<bigChance) {
      rad*=5;
      fill(255,0,200, 128);
    }
    else fill(100,200,255);
    
    if(random(100)>80) 
      ellipse(50+i*30+random(randomness),
        50+j*30+random(randomness),
        rad,rad);
    else ellipse(50+i*30,50+j*30,rad,rad);
  }