Prototype Lego-Style Memory Card Keychain Case
While this isn't an actual product—just a mocked-up proposal by a Chinese company hoping to find a distributor—these Lego-style silicone rubber memory card keychains are kind of nifty. The apparently even clip together so that you could store multiple memory cards all together.
Problem is, we don't think we'd trust even Lego bricks to stick together indefinitely in our pockets along with our keys. But for just a single memory card we might go for it—especially since they should be super-cheap.