This is a link to some pictures of my greenhouse made from recycled materials. The only materials not recycled were the foundation and roofing material. The siding is fiberglass covered in crushed rock. The floor is flagstone and marbles the flagstone used to be the old sidewalks from the capital hill area of Denver these were replaced in the 80s.Its not finished yet and I don't have much in it but its a lot of fun.
Here is a link that might be useful: my greenhouse