For these easy ornaments you only need a sheet of foam (or construction paper), pom-poms, glue and a hook( I used a pipe stem cleaners glued to the back).
The top ornament I tried to cut out the branches on the foam but the second one I only cut a triangle. Then we glued on the pom-poms. For the trunk we glued 3 pom-pom together.
We hot glued the pom-poms but craft glue works well too.