A Ponzi scheme is a type of fraudulent investment operation where the operator pays returns to investors from their own money or the money paid by subsequent investors, rather than from any actual profit earned. A PYRAMID scheme is an illegal business model that involves promising participants payment or services, primarily for enrolling other people into the scheme, rather than supplying any real investment or sale of products or services to the public. COLOR schemes are arrangements of colors used in design, such as in interior design, fashion, and graphic design. A RHYME scheme is a pattern of rhymes at the end of each line of a poem or song.