More to explore:
Old windows, mini greenhouse. I love, love, love this idea! It seems like one of the easier DIY greenhouses I have run into.
DIY Green house with lumber and old windows.
Garden Greenhouse using old windows http://simplycountrylife.blogspot.com/2012/02/greenhouse-just-in-time-for-spring.html #greenhouse #green #house #garden #gardening #ideas #old #windows
Simply Country Life: Old windows use to build cold frame greenhouse box
Old windows, mini greenhouse. My grandma had a cold frame like this!
Green house with lumber and old windows. Small greenhouse to keep deer and other animals out
little green house with lumber and old windows...we always called these cold frames - Dad would make them from the old windows :)
I designed this mini greenhouse for the bottom of the garden because we couldn't find any that would fit the depth of the border. The plants are thriving in there now. (South Wales)
Shabby shack made from old windows. Love this!!
lovely upcycle, made with old windows -- Garden Shed by Calico Apron, via Flickr
greenhouse... studio...dining room...
Vihervitriini miniature greenhouse
Perhaps one could make this with old windows and windowed doors.
How To Build Cold Frames From Recycled Windows
Convert old windows to cute mini greenhouses: norrfrid.blogspot....
How To Building a Small Greenhouse atop a raised bed. I would not use treated or red wood because it interferes with the micro-culture you want to flourish in organic soil amendments.
How To Build a Small Greenhouse
Covered Greenhouse Hinged Raised Garden Bed Project » The Homestead Survival
You don't always need to build a big green house, why not try a mini greenhouse made from recycled bricks & windows