Abstract: A method for forming a variably sized wall panel by supplying a face panel of a first material, the face panel having a front face and a back face, the back face having a plurality of crosspieces extending therefrom. The face panel is placed in a mold such that the front face of the face panel abuts a bottom of the mold and the back face of the face panel faces away from the bottom of the mold. A flowable second material is layered on top of the face panel and the flowable second material is allowed to harden such that the back face of the face panel and the crosspieces are frictionally bound to the hardened second material.