You can build a large—in this case, 24’ x 8'—removable, disposable blue screen for under $30 .
As a child in the late 70s, I was first introduced to the concept of using a blue screen in film and video while watching The Making of Star Wars . The compositing technique of filming action against a solid blue background, which could be replaced by any environment or other action filmed later, opens endless possibilities to the filmmaker. Today, off-the-shelf software provides consumers with the ability to put this technique to use in amateur films.
Professional-grade compositing material can be costly, but almost any solid color material can serve as a small blue screen. One popular solution is to use fluorescent green or blue poster board to create small backdrops suitable for close-ups, but what about larger scenes?