I saw this idea online for a Christmas tree ornament that's made using canning lids and rings, rustic twine, perhaps some small beads or other seasonally decorative pieces (like the holly and berries in the photos below), some foam board or cardboard for backing, a hot glue gun, and small pieces of fabric, such as from a loved one's shirt.
These look like they would be fairly quick and easy to make. And they would also make meaningful gifts if the fabric comes from someone who's close to the person you're making the ornament for.