Inspired by ghost town bottle houses, the newest old idea in the modern landscape is building with bottles instead of recycling them. One of the most doable ideas is creating built in seatwalls. These are freestanding bottle walls that top out at about 18 inches tall, with bottles laid in mortar just like masonry units. This contemporary example not only demonstrates how tidy bottle work looks in the garden setting, this one is a carefully though out design. First they utilized only identical cobalt blue bottles. This allows them to be stacked as shown here, with clear geometric precision. The bottle wall becomes the support for a slab of smooth granite mortared onto the top. The back and sides are covered with a veneer of minty mineral cobble.
This "green" building technique takes a bit of practice to create this precision placement, but any skilled mason can create something very similar at your house. For the DIY homeowner, it's a perfect way to experiment with a free material that can be used to create a variety of simple landscape structures. Best of all, when the structure can be lighted from behind you enjoy the transparent nature of glass and all its beautiful colors.