breeze

float inc = 0;
ArrayList _grass = new ArrayList();

void setup() {
  size(500, 300);
  colorMode(HSB,360,100,100);

  for (int i=-30; i<width*1.2; i += random(2,15)) {
    int b = int(random(40,80));
    Grass grass = new Grass(i,b);
    _grass.add(grass);
  }
}

void draw() {
  background(255);
  for (int i=0; i<_grass.size(); i++) {
    Grass grass = (Grass) _grass.get(i);
    grass.display();
  }
  //if (frameCount % 4 ==0 && frameCount < 241) saveFrame("image-####.gif");

}

class Grass {
  float x, angle, inc, sw;
  int units, bright;

  Grass(float _x, int _bright) {
    x = _x;
    bright = _bright;
    units = int(random(10, 20));
  }

  void display() {
    stroke(117,74,bright);
    inc += 0.0523/2;
    //angle = sin(inc)/40 + sin(inc*1.1)/20;
    angle = sin(inc)/20;
    pushMatrix();
    translate(x, height);
    sw=units*2;
    for (int i=units; i>0; i--) {
      sw -=2;
      strokeWeight(sw);
      line(0, 0, 0, -8);
      translate(0, -8);
      rotate(angle);
    }
    popMatrix();
  }
}