Modular shelf pin system

At first glance this seems like a totally boring, almost pointless object. It looks like a shelf pin. You know, one of the things you stick into the hundreds of holes in your adjustable-shelf bookcase. But that is where the similarity ends. This isn't just a shelf pin. No, it's much more than that. This is the foundation of a system.

Why have 500 extra holes in your bookcase? Why not put them to use?

On it's own, this object doubles as a cable organizer for your bookcase; slide your cables in the loop area and plug the pin into a hole. Rotate a few to make the cables flow up, down, in, out.

Then, print out one of the add-on pieces: a small shelf to hold small things; a photo or note holder; a flower holder/vase; a LED light to illuminate your shelf. Design your own "thing" to ride on the base.

The process of creating this "thing" crystallized in my mind what owning a 3D printer is all about -- something I'm calling "Desktop Innovation" (like "desktop publishing" but about t