Piping frosting in lace patterns is one of the ways to create an elegant cake. It also takes much more practice than cutting out fondant flowers.
From and Craftsy: Everything You Need to Know About Piping Techniques
Since piping is most often done on vertical surfaces, practicing on a glass or jar gives the best learning experience. I’m not about to try this but it’s nice to know how if I ever have a few days to practice.