A wall panel structure which is easily assembled and disassembled and is constructed from a plurality of frame assemblies, each frame assembly comprising a first frame component having a first wall and an adjacent second wall, the first wall having an externally accessible abutment surface; and a second frame component having an angled cross section defined by first and second arms, the first arm having an inwardly extending flange configured to engage said abutment surface of the first frame component, and the second arm configured to engage the second wall of the first frame component.