Find a graphic of a holly wreath (or other Christmas design) on the internet or in your clipart. Print out several wreaths, cut out the wreaths, including the center. Glue little photos of your hamsters to the back. Punch a hole in the top of the wreath, thread a thin ribbon through the hole, knot the ends. Hang ornament on your Christmas tree. You can also use old Christmas cards.
Thanks to Madeline for this idea.