PShape square;  // The PShape object

void setup() {
  size(100, 100);
  // Creating the PShape as a square. The
  // numeric arguments are similar to rect().
  square = createShape(RECT, 0, 0, 50, 50);
  square.setFill(color(0, 0, 255));
  square.setStroke(false);
}

void draw() {
  shape(square, 25, 25);
}

PShape s;  // The PShape object

void setup() {
  size(100, 100);
  // Creating a custom PShape as a square, by
  // specifying a series of vertices.
  s = createShape();
  s.beginShape();
  s.fill(0, 0, 255);
  s.noStroke();
  s.vertex(0, 0);
  s.vertex(0, 50);
  s.vertex(50, 50);
  s.vertex(50, 0);
  s.endShape(CLOSE);
}

void draw() {
  shape(s, 25, 25);
}

PShape s;

void setup() {
  size(100, 100, P2D);
  s = createShape();
  s.beginShape(TRIANGLE_STRIP);
  s.vertex(30, 75);
  s.vertex(40, 20);
  s.vertex(50, 75);
  s.vertex(60, 20);
  s.vertex(70, 75);
  s.vertex(80, 20);
  s.vertex(90, 75);
  s.endShape();
}

void draw() {
  shape(s, 0, 0);
}

PShape alien, head, body;

void setup() {
  size(100, 100);

  // Create the shape group
  alien = createShape(GROUP);

  // Make two shapes
  ellipseMode(CORNER);
  head = createShape(ELLIPSE, -25, 0, 50, 50);
  head.setFill(color(255));
  body = createShape(RECT, -25, 45, 50, 40);
  body.setFill(color(0));

  // Add the two "child" shapes to the parent group
  alien.addChild(body);
  alien.addChild(head);
}

void draw() {
  background(204);
  translate(50, 15);
  shape(alien); // Draw the group
}