Oh, you mean a backdrop for your webcam.
My advice to you is the same as my advice to him: get proper lighting, and a good backdrop.
Pretty much every video program out there that does chroma key uses only one color, because using multiple colors can cause problems elsewhere in the picture. It affects color quality and could cause things that are not supposed to get keyed out to become keyed out. The correct solution is to get proper equipment, not hack it up with a thousand color keys because the shading is inconsistent.