For Christmas I received a terrarium, it was purchased from Pottery Barn. I've never had good luck with terrarium's. "Good luck" as in keeping the plants alive. It sat for two months until one day while watching a Candice Olson episode on HGTV and saw where she put a bird into the exact terrarium.
I changed her idea up a bit by adding an old book and a nest.
The nest was given to me by the mother of one of my friends. The nest is made with the softest material a bird could find. The nest even has hair in it. If any nest belongs under glass this is the one.