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Make Christmas tree ornaments from folded paper or old book pages. Add a piece of paper for a trunk. Punch a hole at the top for adding twine or ribbon for hanging. There are many printables you can use, some are Christmas songs - would make a more festive look.
Tree made from folded half-circle. Think I'd skip the rhinestones. Also: this is the perfect use of a bow. Not just that it's a perfect bow, but it's an integral part of the design, not slapped on as an afterthought. It's also the right proportion and doesn't obscure the focal image. All the cards on her blog that have bows get it right.