Bamboo has become very popular in flooring. But there are other area's in the home for its use. This includes cabinets and shelving.
Bamboo is not only a renewable resource, but it is one of the most durable hardwoods and the most water resistant.
Most of the time your bathroom vanity is made of medium density fiberboard, and this is the cheap way to go. Now you can use solid bamboo. Not only will your vanity be durable it will be a start in going green.