Piping Frosting Lace and Other Patterns
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.