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Cut the front of the card away from the back. Next, cut the front of the card into puzzle shapes; draw the lines out first if you need to. Try to put them back together again when you are done.  Cards with full images, such as a Christmas scene, work better than cards with a single image or word. Keep your puzzle inside an envelope or empty candy tin. Cut a card in half using the crease as a guide. Cut 25 sheets of paper down to the same size as the card. Sandwich the paper between the front and back covers of the card. Staple the card along the edge: once at each end and once in the middle.  You can use printer paper, binder paper, or sketchbook paper. If you want a nicer finish, use cardstock or thin cardboard for the back of the notebook instead of the back of the card. For a nicer finish, wrap patterned washi tape over the top edge of the notebook to hide the staples. Cut the covers off of 4 vertically-oriented cards. Use an awl or a mini hole punch to poke a series of holes along each of the long edges. Thread a yarn needle with yarn or twine, then sew the long edges together with a blanket or whipstitch to make a block. Use the luminary with LED candles.  Use cards that are from the same event or holiday. Don't mix and match cards, such as birthday and Christmas. Make sure that the cards are all the same size and height, otherwise, the luminary will turn out crooked. Take cards from an event, such as a wedding, and cut the covers off. Glue the cards together to create a rectangle or square. Use a craft blade to cut a hole from the middle a little smaller than a photograph. Choose a photo from the event, then glue it to the back of the frame, so that it shows through the hole. Overlap the cards to create a collaged effect. Choose a ceramic or cork tile, then trace it onto a card. Cut your tracing out, then glue it to the front of the tile with waterproof decoupage glue. Seal the top and edges of the card with more decoupage glue. Let the glue dry, then add a second coat.  If you are using a ceramic tile, glue felt or cork dots to the back so you don't scratch your table. Some glues need to cure for several days. Read the label on the bottle for complete drying instructions. You can use this technique to decoupage the cards onto other items, such as boxes or notebooks.

Summary:
Cut a fancy card up to make a puzzle. Staple paper to the back of a card to make a mini notebook. Cut apart 4 cards, then stitch them together to make a luminary. Make a frame out of cards from a memorable event. Decoupage cards onto tiles to make coasters.