[Epiphile]

I can't wait to see what you come up with, personally. I like the sound of what you have in mind.

Undergrounder- good point about the Pleuros' roots wanting to stay moist. I believe there are a few lithophytes in there, but I guess it really narrows the choices down. Perhaps growing live moss on the stones and planting on top of that would encourage them some, and certainly might help in keeping the maintenance down.

There was a thread on this board that I'd read a little while ago where someone asked what would grow well on stone- looking through there might give you some neat ideas, as I believe there were some photos of some pretty impressive displays.

On a side note, I'd love to get my hands on one of those B. exiguums- adorable.