Okay, first of all let me tell you something. I am a totaly DIY kind of person. Comment me some links to your Instructables! I'll visit them and comment back.
Second of all, if you are a fan of Nerf, you'll love this. This case can be hidden as just a piece of paper on the ground. It's color can change so you can camoflauge it as part of a tree or something. I'm going to do it in white so you can see it. Real easy.
This can be used as a Nerf hat too!
Nerf Bullets (or any foam bullets like Buzz-Bee or something.)
Gun (Again, any kind.)
Friends willing to fight!