Stück Natur: The Microenvironment-in-a-Jar by Hans-Rucker & Co. This is a museum piece, but looks easy to duplicate with a miniature house or shed, soil, and moss in a covered glass jar - very charming!
Kokedama ~ Japanese in origin, a kokedama is a tabletop Moss Ball that contains a plant or bonsai. This one is a Rabbit's Foot fern and rests on a curved stone plinth. bringing a quiet, gentle pocket of nature to a desktop.