MIT ingenuity is at again with the Junkyard Jumbotron. Using scannable QR codes and whatever cellphones or tablets you might have on hand, it creates impressive multi-monitor displays on the cheap. Clever!
What do you need? It's pretty simple: The app, some devices (any OS, any size), and a camera to snap a pic of all the devices displaying the QR codes. Voila. Instant "Jumbotron" on the top of your desk.