While I tried my hand at making tiny terrariums (see How to Make a Light Bulb Terrarium), there's nothing like the original. Juliette has been making some lovely terrariums for her Etsy store and posting some of her best work online.
What originally started as a fun way to make Christmas presents, Juliette Melton's light bulb terrariums eventually turned into an Etsy store product filled with various substrates, different mosses, and different types of tillandsia.
While her terrarium adventures are documented here on her blog, her best work can be seen at Tiny Terra and her work purchased at Modern Eden.
(Images by Juliette Melton)