Bryce Bell of cardnetics created this business card design that features a built-in aperture mechanism. Pull the lever down and the aperture opens up. If you run a photography-related business, this could be a neat business card to pass out to your clients. Pre-assembled cards start at $6 each, while you can buy kits that you put together yourself for $2.50. If you want to try printing and laser cutting the card yourself, the design templates are available here.