SH Interiors Hi. It looks like a 3 x 6 subway tile. There are many manufacturers to choose from and you can find it at most tile stores including some of the large box stores.
A 24"x24" almost-black tile grounds the floor and contrasts dramatically with the white ceramic subway tile. The checkerboard towels repeat the high contrast in this kids' bath. Red accents add pops of color.
Proof in the power of accessories: A few brightly checkered towels, a quirky towel basket, a stuffed bunny, and this ultra-minimalist bath suddenly feels perfect for little ones. Now picture it with a sleek vase in place of the basket, crisp white linens and a piece of modern art propped at the end of the tub: a dramatic makeover with next to no sweat equity.
Kids bath-black or charcoal rectangle floor tile brick laid and white subway tile with a pencil band then larger hexagon then pencil, then back to subway.