We think one of the greenest things is to use materials that are made to last through the ages. End grain wood floors are the epitome of durable and add instant warmth to any space... Kaswell is one maker of wood block floors, which is made up of 1" thick wood blocks turned on end. With the grains perpendicular to the wearing surface, the floors hold up forever. There's a reason end grain wood floors were once commonly used in factories: they are strong! End grain wood blocks were once even used to pave streets:
The blocks might be strong, but their appearance is as soft and warm as brick.