Here's a design for a minimalist folded wallet that you can print and assemble yourself; it resembles three fanned-out cards when shut, and opens into a two-pouch wallet just the right size for a couple credit-cards and some cash. The creator (who has released this under a CC license) suggests scanning the bar-codes for your supermarket and gas-station cards and adding them to the design's back before printing it, so that you can eliminate those cards and ask the cashier just to scan your wallet, which is dead clever.
(Thanks, Philip!)
