Knowing your niche - Bathroom niches Niches are an innovative way to create a beautiful yet practical feature within your bathroom or kitchen renovation. Gorgeous black & white bathroom with porcelain floor tile used a feature wall with decorative niche - bathroom renovation by Master Bathrooms & Kitchens. Definition: niche - n. noun (1) A cranny, hollow, or crevice, as in rock. (2) A situation or activity specially suited to a