Congratulations, you baked a cake! Now what? If you're not up for pastry tips and homemade buttercream, the best way to decorate a cake might be to make your own stencils. Cut them out on paper, or use lace doilies, and sprinkle powdered sugar or sprinkles over the top of the cake, using the stencils to create a pattern. Voilà — an Instagram-ready dessert.