Adding texture is crucial to prevent a black bathroom from feeling too flat or monotone. Textured black tiles, such as hexagonal or subway tiles with a raised finish, add visual interest. For a sophisticated touch, consider incorporating materials like wood, concrete, or marble. A wooden vanity or shelving unit against matte black walls can create a warm contrast while maintaining a sleek, modern look. Additionally, plush towels, rugs, or velvet curtains in contrasting colors can introduce softness and depth, balancing the starkness of the black.