I found my unicorn tile, DalTile's Perpetuo in Infinite Black and Brilliant White - porcelain options that, in my humble opinion, look like a near exact match to marble, gleaming polished finishes ...

The wall in this bathroom by @mosierluxuryhomes uses oversized porcelain tile ... Note the black and white patterned floor tile, and the black marble shower wall juxtaposed against the ivory ...