Sand down a pallet board and round the edges, I'd probably paint it red or green, and use a toothbrush white paint splatter technique. Maybe use smaller letters and put Jingle bells or any other Christmas season related.
Add a bell for every year starting with your first Christmas as a married couple. Add red bells for when you have a baby, and green bells when you have grand kids. Can use a Sharpie to write the year on the bell