Since the dawn of the green screen and chroma keyer the term virtual set has meant different things to different people.
TCT has built a variety of flats over the years, and we've used a variety of materials in doing so.
Space Requirements for Chroma Keying
The first consideration is whether this is a permanent or temporary setup.
Many productions that are done on television are made for a specific audience. Seldom does one of those productions spawn a cult like phenomenon.