Pepakura is the Japanese word for papercraft. So yes, pepakura does include origami. Specifically, the term refers to 3D models made from paper. And what better contraption to make out of paper than this awesome Halo 3 (XBox 360) helmet? Broken down into its geometric components, this helmet is a life-size replica of the helmets you wear in the game.
Best of all, because it's made using jesmonite, a gypsum material, it is very sturdy and will last for years to come. Check out this four-part video series to get the how-to.