Top 10 amazing movie makeup transformations. Foam board, also known as foamcore or foam core, is a backing material widely used in framing art. It is made of a type of Styrofoam™ covered on both sides with paper or plastic so that the foam is the core of the sandwich.op 10 amazing movie makeup transformations. Foam board, also known as foamcore or foam core, is a backing material widely used in framing art. It is made of a type of Styrofoam™ covered on both sides with paper or plastic so that the foam is the core of the sandwich.