Terrazzo floors. Seemingly indestructible, terrazzo gets high marks for durability and good looks. This material, made of chips of marble or granite set in concrete and polished, also can score high for sustainability if you use no- or low-VOC sealers and low-impact aggregates such as recycled glass. Although terrazzo can be pricey, a bathroom, with its relatively small footprint, can be a great place to splurge on this top-notch material.