tri

PImage img;

void setup() {
  img = loadImage("https://s-media-cache-ak0.pinimg.com/736x/d1/cd/39/d1cd392fe6a250f8cc419f0d3eb43acb.jpg");
  size(img.width, img.height);
  img.filter(POSTERIZE, 10);
  background(20);
  noStroke();
  //image(img,0,0);
}

void draw() {
  for (int i=0; i<50; i++) {
    paintStroke();
  }
}

void paintStroke() {
  int tx = (int) random(width);
  int ty = (int) random(height);
  translate(tx, ty);
  color col = img.get(tx, ty);
  fill(col, 200);
  pushMatrix();
  rotate(random(TWO_PI));
  beginShape();
  float angle=0;
  float d = random(5, 20);
  for (int i=0; i<3; i++) {
    float x = cos(angle)*d;
    float y = sin(angle)*d;
    vertex(x, y);
    angle+=TWO_PI/3;
  }
  endShape(CLOSE);
  popMatrix();
}

void keyPressed() {
  save(random(1234)+".jpg");
}