The creative minds at miniWIZ recently debuted the POLLI-Brick, a recycled polymer bottle that can be interlocked to build an incredible array of structures. Made from recycled PET bottles, the lightweight bricks offer excellent acoustic and thermal insulation and can build anything from fences and roofs to pots for plants, skylights and beautiful walls of light.
via inhabitat.com
these would be ideal for fences facing west to catch the afternoon sun from the street but would maintain privacy and cut traffic noise. What about green houses