I keep them in a binder but I've done this with doubles: trim it down a little with scissors using your drivers license as a template. Take it to a copy shop that laminates ID cards and similar cards. Have them laminate it and then punch a hole in it. The reason you trim it down to card size is that they have a special machine that does hard, thick lamination on cards but it only does that size. It's a cute keychain or badge. You can even customize the card before you laminate it.