Go to Flickr and search for "lithops", and you'll see some wonderful pictures.    From Wordnik.com.  [ianrandalstrock's Journal] Reference

Oh, and aside from orchids, we learned what lithops are plants that look like rocks.    From Wordnik.com.  [ianrandalstrock's Journal] Reference

I thought it was pretty, and brought it into my basement, setting it on a table where I keep lithops plants...under fluorescent lights.    From Wordnik.com.  [Scientist attacked by vicious mantid!] Reference

I think it is named this because it looks like several of the smaller “living rock” cactuses, some varieties of lithops in particular, which have geometrical whorls stacked verticallyh.    From Wordnik.com.  [URBAN CACTUS HIGH-RISE | Inhabitat] Reference

I have several lithops.    From Wordnik.com.  [Apartment Therapy Main] Reference