Simple functions plotted in polar coordinates can create astonishingly complex shapes that look like small insects. Several basic shapes (circle, square, star, rose, and cardioid), each with a weighting factor that can be adjusted using the appropriate control, can be mixed together to generate the final shape. Some shapes (star and rose) have additional parameters that further control the shape. The cardioid is especially useful, due to its asymmetry.
Created in combination with the Ludum Dare 48 game creation contest [1]. I created a game about evolution, using this method for procedurally generated little animals and plants.