At the meltmedia office we're making a video podcast once a week. Our design team made a cool backdrop for the little studio area we use. It's a big-ass inkjet direct-print on a full 8' by 4' sheet of foam core. As you can guess, it was a bit floppy and needed some kind of support behind it.  It also needed to be lightweight because we wanted to be able to hang it on the whiteboard behind us so we could easily remove it and replace it when we needed the whiteboard. I looked around the garage and all I had that was long enough was an 8' 2x4. So, the entire frame is made from that single pine 2x4. I ripped three 1" strips from it. to get the top, bottom and sides. The sides are just a long piece cut in half.