You've never been short on ideas for Raspberry Pi cases, but now there's an official created by the Raspberry Pi Foundation itself. It's a solid looking case that will only cost you around $11.
The case is made of plastic and will only work with the Raspberry Pi Model 2, A+ and B+. The best feature (aside from the low price) is a removable top that allows you to add accessories, including the camera board and the Adafruit PiTFT touchscreen. The sides also come off so you can get access to the GPIO.