Use them as postcards
Cut off any picture side that doesn’t have writing on the back, and save them to send next year as Christmas postcards.
Cut into gift tags
Cut them up into gift tags. This is an easy craft that kids enjoy.
Create napkin rings
Create cute napkin rings just by cutting the cards into strips, rolling them up, and taping or gluing them.
Construct holiday coasters
Cut pieces of cardboard and Christmas card covers into matching shapes for coasters and glue them together. Then varnish with a decoupage glue, which can be found in craft stores.
Devise a sign
Fashion a Merry Christmas or Season’s Greetings sign by cutting each card into a separate letter that spells out the message. Affix your message to a door or window, or hang them from ribbon.
If you’re giving books as holiday gifts, cut a colorful card into strips and tuck one in each as a bookmark.
Make a sachet
Make a sachet simply by gluing the bottom and sides of a holiday card, inserting some potpourri, punching two holes in the top edges, and tying with ribbon. Hang it on your Christmas tree or over a doorknob.
How To Recycle Christmas Cards
Use them as postcards 
Cut into gift tags
Create napkin rings
Construct holiday coasters
Devise a sign
Make a sachet
