(Photo Credit: Country Living)
This is a similar idea to one I shared a while back with baby shoes (display the gradually increasing sizes of your child's shoes in a cute shadow box. Tag each shoe with the size and age of your child at the time).
Score a shadow box (always on sale at Michaels and Hobby Lobby) and adhere paper to the back (I use paper from the scrapbooking section). Use double sided tape to stick your favorite ornaments on top of the paper.
Wha-la!