Might I suggest gift card holders? You could make them with two pockets, one for gift cards and one for discount punch cards. I made one last year with an elastic closure for my neice using generic fabric, not Christmas. If you made them from anti-RFID fabric, they would make good holders for debit or credit cards. Two pockets would enable you to store the card on one side and receipts on the other.
Sorry I don't have a link to a pattern, but it seems you could make these fast and use up scraps.
Good luck on your endeavour!