Share a little about the materials, processes, and techniques used to create this cake Royal Icing, thinned royal icing, gold luster dust, sugar cookies. What are you most proud of? Those tiny roses I made on the end of toothpicks. What advice would you give someone starting this project? Have patience! Depending on how elaborate you want to be each cookie can take 30-45 min to decorate, not counting the time for the royal icing to dry in between applications. bebetweenbeapplications.