I used heavy weight decorative paper for the main body, lined the insides with sticky backed foil duct tape and used a few more pieces on the outside edges to make them durable. I used a round punch, half way over the edge, to make the little finger divot doing the sides one at a time before I taped the edges together.
These covers will protect my cards - debit and credit - that have a chip (RFID - radio frequency identification) in them from being scanned by accident.
You can see a documentary video here about how easily your information can be obtained without your knowledge. Of course, there are companies out there selling protective card sleeves for this purpose but I thought it would be fun to make my own and make them personal!! Might consider adding some alcohol inks and/or permanent marker doodles to these as well.
Therese