If you use your Raspberry Pi as a regular computer a lot, you might be looking for a more permanent case for it. Adafruit has put together a guide for a premium case that packs in the monitor and all the components.
This case is expensive to build, but that's kind of the point. It looks nice and works great, while being portable to boot.
To build it, you'll need a 10" HDMI display, a Raspberry Pi 2, a set of batteries, audio amplifier, and a few cables. You'll also need to 3D print the case, which you can outsource without buying a 3D printer. The end result is a very sleek looking little all-in-one case that should make toting the Raspberry Pi around pretty easy.
10" Raspberry Pi Desktop [Adafruit]