Have heard that magnetic shrimp boats, on a vertical screen, were once used in Oz. With the aid of a spray can of water, you could really ruin someone's day!
Back to the topic in question. Calgary TCU use the Converging Runway Display Aid which helps controllers vector to crossing runways and can be used when only one runway in use, as well. This was originally developed in America as a departure tool and after certain mods is used for enroute & arrivals. Vancouver centre use it as well as a couple of places in the States. For more details pm me.
Rgds
FT