You can make cute Christmas ornaments of colored buttons of different sizes and colors. Take a plastic ball or other ball as basis and glue the buttons at it. Add a decoration as the beads.
Pyramids, cones, cylinders. It are easy to do from the buttons of different sizes. Buttons strung on a wire, and the wire ends are a hook for hanging. In the same way you can to make miniature Christmas trees.
Even easier to make a small (or large) button Christmas wreath. Just tightly strung buttons on the wire or thread and tie them in a circle. Decorate the Christmas wreath with ribbons, Christmas balls and ornaments.