Straight Metal Jacket

I want to build a modular system that allows me to hang things on a straight rail mounted a few millimeters from the wall. In my office at work, I have one of those hanging rail systems that allows me to attach a whiteboard, or book case, or whatever. Well, I want that for the home.

This set of things slip over a straight piece of aluminum or steel and provide some mounting holes. These jackets can be screwed into a wall or other surface, and provide a convenient attachment rail system.