Here's 13 ideas for using belts for decor. The wall hanging is the 9th one down. I hope this helps. Wishing you the best.
Buy some colored clothespins and clip your Christmas cards to it. Perhaps tie a big jingle bell on the bottom!
I don't know if this is what you are looking for: https://www.hometalk.com/9661967/diy-upcylced-belt-wall-art?expand_all_questions=1
I just came back from Nashville and saw many in frames with the glass out. Looked really cool, especially when using the same colored belts. You can also use them as a way to hang sunglasses in a closet.