Cookiefied versions of “Star Wars: The Force Awakens'” best character: Poe’s Jacket.
*You want your royal icing thick to start, because your food coloring will thin the icing considerably. (If you use the recipe I linked to, the starting consistency is perfect.)
It's not best practices, but I just took apart and rinsed out and dried my piping bag and coupler in between each color. I hate wasting bags.
Packaging note: Make sure to use grease-proof cookie bags when packaging your cookies! The plain brown lunch bags I used for photos began to show marks after an hour or so.