LEGO blocks are one of the most enduringly popular toys around. With endless possibilities for reinvention, they challenge minds and cultivate creativity. But as much as we love these colorful little blocks, we have to say that it wouldn’t hurt if they were also a little more eco-friendly. But here comes a sustainable take on the classic block from Japanese firm Colors Tokyo. Fashioned from environmentally friendly materials, the company’s Earth Blocks are an exciting prospect for educating kids on green building.