This past weekend has been spent in Ohio with a slew of family and (new) friends. When we got to Ohio on Friday, the biggest news was that everyone had spent the day putting together a new little greenhouse...and I'm completely enamored with it. (though this could be enhanced because I didn't have to do any of the work.)
The greenhouse came in several boxes, and from what I gather, all you have to do is: dig out a shallow foundation; put the pieces together; fill the foundation with loose stone/gravel/etc.; add plants.
The greenhouse will stay ventilated in warm weather and warm in cold weather, so it's perfect for helping you to keep that green thumb all year long.