size(500,300);
background(255);
strokeWeight(0.5);
smooth();

int centX = 250;
int centY = 150;

float x, y;
for (int i = 0; i<100; i++) {
  float lastx = -999;
  float lasty = -999;
  float radiusNoise = random(10);
  float radius = 10;
  stroke(random(20), random(50), random(70), 80);
  int startangle = int(random(360));
  int endangle =  1440 + int(random(1440));
  int anglestep =  5 + int(random(3));
  for (float ang = startangle; ang <= 1440 + random(1440); ang += anglestep) {
    radiusNoise += 0.05;
    radius += 0.5;
    float thisRadius = radius + (noise(radiusNoise) * 200) - 100;
    float rad = radians(ang);
    x = centX + (thisRadius * cos(rad));
    y = centY + (thisRadius * sin(rad));
    if (lastx > -999) {
      line(x,y,lastx,lasty);
    }
    lastx = x;
    lasty = y;
  }
}