This Lithops - Lithops dinteri var. brevis stays pretty small and kind of has to labor in the shadow of its more flashy siblings. But I'm a bit strange...I like it. It's simple, straight forward and petite.
Lithops terricolor is another of the smaller growing species. This one (C134) - the Prince Albert form - is from 5 km North of Prince Albert, SA. and has the typical heart-shaped leaves. I think they're very attractive.