This card will carry 12 quarters in your wallet and is very simple to make.
What you need:
1. An old card "credit card size" I used my old swimming pool pass.
2. Some sticky putty, normal used for sticking posters or decals on the wall.
3. Coins of your choice, in my case 12 quarters.
Break off a very small bead of putty put it on the center of the coin and press on to the card, do the same on both sides. That's all.
Put the Coin Card in your wallet.
To get a coin off just bend the card slightly and pry it off, scrape the putty off the card before putting it back in your wallet.