Abstract: A plastic contoured seat back includes an inner and an outer shell affixed together. The inner shell includes a three dimensionally curved front surface and a two-dimensionally curved back surface. The inner shell may include an internal rib adjacent the top of the shell that is shaped differently from the top edge of the inner shell. The internal rib is adapted to allow the inner shell to be cut adjacent the internal rib so that the inner shell can be varied in shape. The shell may also include indentations on the back side of the shell adjacent the corners of the inner shell. The indentations are dimensioned to receive overlapping fabric that is pulled around the corners such that the fabric on the back of the shell adjacent the corners does not project outwardly more than the fabric elsewhere, despite the overlapping of the fabric at the corners. The inner shell may also include a plurality of uniquely identified holes adapted to allow a variety of different ornamentation to be attached to the inner shell.