You can call this a garland, bunting, or string … doesn’t matter!
Sort your Christmas cards into themes if you like, then sort them into sizes so you can glue them back to back.
Use an awl to make holes, then tie them together with thread or yarn added using a darning needle!
I spent a part of one afternoon, and recycled about 50 cards.
This is the reverse side of the same garland as shown in the frist photo.
Great for hanging across doors and windows where they will be seen from both sides!