A method of manufacturing a tile sheet for a shower wall or bath enclosure in which a user designs a tile pattern which is stored in a database. An acrylic sheet is placed on a frame and clamped in place. A computer controlled router cuts grout lines in the acrylic sheet which simulates a tile pattern. The finished sheet having the tile pattern is cut and installed on a shower wall. Other designs can be stored in the computer and used to create different tile patterns using the same computer controlled router.