Wash place, relaxing refuge, homemade gin receptacle -- a bathtub can serve many purposes. As the move toward modern minimalist home interiors expands into the bathroom, concrete tubs in particular have grown in popularity. Their sturdiness compared to acrylic and fiberglass models and relatively low cost make concrete tubs an attractive alternative to stone and iron tubs. As in other areas of the home, concrete's capacity for easy molding and coloring give owners the chance to have a one-of-a kind tub as well as one that can be designed to fit even the tiniest of washrooms. Its heat-retaining quality means you can stay in the tub longer before the water gets cold. The only snag is that it can be heavy and awkward to install [sources: freshome, Bathtub World].