It's also my entry for the Gorilla Glue Contest so it would be nice if you voted for it.
Step 1: Materials
A box cutter
Fabric of your choice
A Cardboard Box
The packaging from a 12 pack of soda.
Step 2: Pockets
Then make small pieces of cardboard and glue them to the edges of the pocket (like in the second picture).
Step 3: The Body
Then glue the pockets on to the cardboard pieces, but only put glue on the little cardboard pieces from the previous step, otherwise you won't be able to get your cards in.
Step 4: Assembly
Then cut your fabric into a piece slightly bigger than the wallet on all the sides except for the top.
Glue the bottom inch or so of fabric to the bottom edge of the wallet and then fold the fabric up to the top. Fold the ends of the fabric in and glue them to the cardboard.
You should have a pocket between the fabric and the cardboard where you can keep cash.