void setup() {
  size(400, 400);
  background(255);
}

void draw () {
  int b = int(random(255));
  stroke(rc(b), random(255));
  drawRectangle(random(width), random(height), random(200), random(200));
}

void drawRectangle (float x, float y, float w, float h) {
  strokeWeight(random(0, 2));
  int b = int(random(255));
  fill(rc(b), random(255));
  rect(x, y, w, h);
}

// Generate a color somewhat near parallel to 
// the gray line in the color cube (what's that called?)
color rc (int k) {
  int[] rgb = new int[3];
  for (int i=0; i<3; i++) {
    float rand = random(2);
    int bool = 1;
    if (rand > 1) {
      bool = -1;
    }
    rgb[i] = k + (bool * int(random(50)));  
  }
  return color(rgb[0], rgb[1], rgb[2]);
}