Look for cards that are made from sturdy card stock with simple or bright designs. I didn't use all of the cards I've been sent as some just didn't work well. Using either scissors or a cutter for scrapbooking, cut the cards into strips. Once cut use a paper hole punch and punch a hole in the top of the bookmark but not too far down.
I used burlap twine as decoration but you could also use fun ribbon.
They are light enough to put into your new Christmas Cards as a small gift and not be charged extra by Canada Post when you send them out.
So scrounge up your old cards and get crafting away!