Thinking I might do this on top of the chicken coop!! What a great way to keep them cooler in the summer and warm in the winter!!!
A-Frame 4x6 chicken coop (up to 15 chickens) from My Pet Chicken
Poop trays make for easy cleanup. "This is the way my husband built our hen coop. It is the greatest. I just pull them out and sweep the chicken poop into a big tub and it is ready to be added to composting. Absolutely love it! Clean-up is a breeze."
Below ground greenhouse. Like a basement the temperature stays constant year round.
Insulated Foundation Greenhouse
How to build an underground greenhouse and have food year round for $300!
greenhouse of Babylonstoren // An Exceptional Country Getaway in South Africa
Awesome collection of projects as well as tutorials on how to make your very own DIY greenhouse
DIY Straw Bale Greenhouse
Raised Planter - The hinged lid allows for quick access, as well as easy venting. Hoop house plastic can be rolled up in the summer to keep rain off tomatoes, or removed entirely during the hot months.