The good folks at Evil Mad Scientist Labs have cooked up a great HOWTO for baking butter cookies with Sierpinski fractal patterns, using a simple pixel-art cookie technique:
A few months ago we showed you how to make beautiful fractals in polymer clay. Take that idea, run with it, and where do you end up? In the kitchen, making Sierpinski cookies! These cookies, made from contrasting colors of butter cookie dough, are a tasty realization of the Sierpinski carpet, producing lovely, edible fractals. As with our earlier project involving clay, you can make these by using a simple iterative algorithmic process of stretching out the dough and folding it over onto itself in a specific pattern.