I'm knid of curious about how many high schools and colleges out there actually incorporate floors into their scenic designs. When I was in high school we started doing this my senior year. Now it seems a must. I can't remeber the last show I did with a black floor. It is avery interesting part of the design process and if you have the time and budget to use it at your school definitely consider it. There are all sorts of paint treatments, carpeting, wood floors, tiles, I have even been involved with a show that took place in a garden, so half of the set was live plants( don't go there unless you absolutely have to). Floors can do amazing things for the creation of a new world.