the HYPE Framework / Joshua Davis

import hype.*;
import hype.extended.colorist.HColorPool;
import hype.extended.behavior.HRotate;

HDrawablePool pool;
HColorPool  colors;
int      colorIndex = 0;

void setup() {
 size(640,640);
 H.init(this).background(#242424);

 colors = new HColorPool(#FFFFFF, #333333, #0095a8, #FF3300);

 pool = new HDrawablePool(200);
 pool.autoAddToStage()
  .add(new HRect().rounding(10))
  .add(new HEllipse(), 25)
  .onCreate(
   new HCallback() {
    public void run(Object obj) {
     HDrawable d = (HDrawable) obj;
     d
      .noStroke()
      .fill( colors.getColorAt(colorIndex) ) // select a color at a specific index in the HColorPool / 0 = #FFFFFF
      .loc( (int)random(width), (int)random(height) )
      .anchor( new PVector(25,25) )
      .rotation( (int)random(360) )
      .size( 25+((int)random(3)*25) )
     ;

     HRotate r = new HRotate();
     r.target(d).speed( random(-4,4) );
    }
   }
  )
  .requestAll()
 ;
}

void draw() {
 H.drawStage();

 for (HDrawable d: pool) {
  d.fill( colors.getColorAt(colorIndex) );
 }
}

void keyPressed() {
 switch (key) {
  case ' ':
   colorIndex = ++colorIndex%colors.size(); // press the spacebar on your keyboard to cycle through the colors
  break;
 }
}