Since Raspberry Pi started shipping earlier this year, people have been getting creative with programming them to do all kinds of awesome stuff, and because they don't come with a case, you have to get creative about that part too!
This project is from Jude Pullen, a design engineer at Dyson, and master at cardboard modelling. He uses physical modelling as a design development tool, and his step by step tutorials on youtube show you the skills you need to master this art too. We love cardboard as a material, because it can be surprisingly strong and durable depending on how its used, as we saw with this amazing cardboard bike recently.
Here's an intro by Jude and a full step by step so you can make your own!