My way of making quite sturdy wallets out of duct tape. They look good too.
Warning! It's a good bit harder to make these than the normal sheet made ones.
Helps to have something smooth and clean to make it on.
Step 1: Make the templates
1. Find a good sized piece of cardboard or a plastic sign.
2. Cut 3 rectangles out of it measuring 9in x 3.5in, 2.75in x 3.5in, and 2.25in x 3.5in.