Among the most unusual sinks you’ll find, the Cobblestone Green Onyx vessel sink is made up of translucent layers of green onyx and natural cobblestone. Each handmade sink is crafted from cobblestone that is hollowed out to form a bowl, then onyx chips are adhered to the bowl’s interior with a food-safe epoxy. The bowl measures 16 inches by 16 inches. Cost: $665. Lenova. 877-733-1098.