The first (above) is built around a timber frame. Each bottle is cut to size, using the following steps from the original site:
"The base of each bottle is removed, with scissors. Then a V-shaped slot is cut on either side, near the top of the bottle after its location being carefully measured. A little V-wing is then able to pop out of each side of the bottle so that when the next layer of bottles is stacked it does not slip too far down."
The second, or "Green House" below, is done without any timber at all and made with more than 1,000 recycled plastic bottles. The roof is self-supporting and the bottle bases were sewn together to make a stained glass window over the front door plus bead curtain for the entrance.
While I probably wouldn't ever build a shed out of bottles (the neighbors would hate me. I can only wonder what they're saying about my half-built pallet fence), the idea of sewing together bottles to make a window isn't a bad idea.