Frosting is the simplest way to spruce up a cake. Sometimes all you need to do is spread it smooth. Then there are projects that benefit from a special texture, like furry for a teddy bear or scalloped for the scales on a fish. To master these techniques, spread some frosting on the back of a cake pan, pick a tool, and practice until you get a feeling for how the tool shapes the frosting. You can always scrape the frosting off the pan and reuse it.