Have you seen this magnetic nativity set printable floating around pinterest? I printed it out the other day, laminated it and glued on some magnets. I printed two pages to a sheet so that my characters are a little smaller (I didn't want them taking over the whole fridge.) My kids have been enjoying it ever since.
I love that it is a nativity set they can play with and can't break! And it's easy to prepare. You can print the figures from this link. Scroll down to the end of the post to find the PDFs of the nativity figures. Merry Christmas!