This is 3d printed plastic with an LED Strip light on the inside, you can see the cord sticking out the back in the first picture. I designed it as a modular system so I can add on to it (this is 3, ~6" sections connected).
I have always found it hard to display a large collection in a clean way so this was my solution. I did sell one of these, but it has really been a passion project to clean up my displays. If there is a demand I would consider selling more of them though.