HEX to swatches in Processing

swatches.pde

void setup() {
  size(400, 400);
  noLoop();
  noStroke();
}

void draw() {
  background(0);
  
  color[] colors = { #811eff, #ff0000, #811eff, #ff0000, #00ff00, #00ffff, #811eff, #ff0000, #811eff, #ff0000, #00ff00, #00ffff, #811eff, #ff0000, #811eff, #ff0000, #00ff00, #00ffff, #811eff, #ff0000, #811eff, #ff0000, #00ff00, #00ffff };
  int size = 40;
  int items = floor(width / size);
  
  for (int i = 0; i < colors.length; i++) {
    fill(colors[i]);
    int x = (i % items) * size;
    int y = floor(i / items) * size;
    rect(x, y, size, size);
  }
  
  // Un-comment the line below to save a PNG
  //saveFrame("swatches.png");
}