Lining station walls in 1904, when New York City subway trains made their maiden voyage, the easy-to-clean, 3-by-6-inch white tile became an instant must-have finish for bathroom walls.Subway tile
has become so ubiquitous that its original appearance has almost been forgotten. The historically accurate ones from Subway Ceramics are ⅜
inch thick with a flat surface, a square edge, and a glossy white glaze. Coupled with pencil-thin grout lines, they're a dead ringer for vintage subways.
36FT00 3x6 field tile, about $16 per square foot; Subway Ceramics