City dwellers without yards aren't completely banned from having a green thumb. Thanks to a well-placed tabletop terrarium, anyone can have an exotic garden in their living room. I love the height of this version from Gump's. For something more modern, try these lidded glass jars from Smith & Hawken. They even give you a full tutorial on gardening indoors.
I have a small terrarium in the dining room, but it is currently unoccupied. I guess I need to make run to Hortica on Castro for a few plants this weekend.