A changeable wall structure includes a frame which removably holds a plurality of inner decorative panels having displays on one or both sides. A combination of a shelf, a shelf extension, and a support are selectively secured to the frame by mounting brackets. These brackets include upper, lower and intermediate support brackets which permit the support of panels in upper and lower positions, in intermediate positions, and in rearward positions and forward positions. Decorative panels are employed, and the forward or outer panels can partially or totally conceal one or more of the inner panels from view. Each decorative panel is preferably changeable and reversible.