Get away from every day cast iron or porcelain fixtures. Check out these bamboo sinks by Modern Vessel. They're made of laminated bamboo and come in sleek, rectilinear shapes. The sinks can sit on a base (as shown up top) or be wall-mounted (special hardware is available for this).
While the natural bamboo looks just great, the sinks are also available in bright-colored stains. The sinks themselves start at $580 and staining is an additional $120.