I rescued (from the trash) a LARGE box of envelopes from my husband"s office. I knew there must be something to do with them. I found this idea in a magazine. It's a great little portfolio for ATC's, gift cards, credit cards, frequent buyer cards, or whatever else is about the size of a credit card.
The biggest challenge was creating a closure that would keep whatever is in the pockets from falling out. What I came up with looks OK but surely won't last.