Idea 3: Galaxy Cookies
1. Divide royal icing into four bowls.
2. Add food gel to three of the bowls of royal icing. You will need a bowl of royal blue, light purple, and gray.
3. Pipe circles of each icing color onto your cookie. Alternate gray, purple and blue until you reach the center. Finish with a dollop of white royal icing in the middle.
4. Use a toothpick to swirl the colors together until you reach the desired galaxy effect. Add silver star sprinkles before the icing dries.