VINTAGE Marbled gray PLASTIC TILE 4 1/4" x 4 1/4 wall bathroom kitchen polystyrene NOS 

This is new Old Stock and many are still in paper bundles of 40.  Due to the manufacturing process, every tile is unique. First two pictures were taken with the same lot of tiles, under same fluorescent lighting. but I changed the background (brown Vinyl, white towel). Last photo was on white towel in halogen lighting. This is why my wife never lets me pick out colors. Feel free to email me if you have any questions. 

This would be the perfect addition to your Mid Century Modern (MCM) décor!