This plant is perhaps my favorite to use in terrariums.  It is not particularly showy, but it stays small and compact and is somewhat non-descript ‘green foliage.  For that reason, I use it in most of my ‘biotope inspired’ (biotope-ish+artistic liberty) vivariums.

The last photo is representative of the plants available.  They are well rooted and shipped meticulously in their pots.