This project can be done and undone as much as you like, so you can customize the tray for any occasion.
Have a baby shower? Try pink and blue yarn colors. Hosting a Halloween party? The classic orange-and-black color combo makes the serving tray hauntingly cute. Find yarn in high school or college colors to decorate the tray to hold cards at a graduation party. This project is so cheap and easy, you can use it for anything.