Bonsai Ficus : Exotic & Air Purifier : Big
Ficus are one of the best varieties of Bonsai trees for indoors. They're very easy to take care of and need little attention. Ficus "Ginseng" varieties have fat trunks, with substantial exposed roots, giving the tree a very exotic and tropical feel.
 
Ficus bonsai trees are quite tolerant of low levels of light. Having said that, they should still be placed in a bright location. It is recommended that some sunlight shines in through a window and actually hits the leaves of the tree. A south facing window is good.