Calfee Design of La Selva Beach, California has a line of bamboo frames that are as beautiful as they are strong. A natural advantage of a bamboo frame is the compliant ride which is especially important for commuters and older riders.

Continuing with the sustainable theme, the frame is joined with hemp cord, and due to the natural light weight and strength of bamboo, frames start at just 4 pounds.

Image courtesy of Calfee Design

Calfee is also involved in the Africa Bamboo Bikes project which seeks to build affordable bicycles for underpriveleged Africans in rural areas. You may learn more about the Bamboo Bike project here:
http://www.bamboobike.org