Did you save them? Do you have a use for them?
How about using them for frugal but creative postcard greetings this year by cutting off the front and sizing it properly?
Or cut appropriate pieces from the fronts (and insides!) to use for gift tags.
Cut pictures from them to decorate your Christmas tree.
Or glue small cut outs from them around the bottom of a pillar candle.
Or make a frugal holiday collage from them.
Or glue them onto paper and cover with white glue mixed with water (half and half), and use them for throwaway Christmas table mats.