I would say make some envelopes for them and use them as a card. They are not hard to make really from the heavier type paper you can get at the craft stores. Or you could check at a scrapbook store for envelope templets.
I have made kids placemats from cut up christmas cards. You elmer's glue them collage style onto lace or paper and then enclose it in clear contact plastic sheets. Run a stitch around the edges and then cut them out just beyond that with pinking sheers. Kids love them.
I also made the cut outs on a kabob sticks and then arrange them like flowers in into a cute pot that has the styrofoam glued inside. Add some greenery on top of the strofoam to hide it. Oh, I add some ribbon and decorations to the pot as a finishing touch.