Well I was thinking about doing a heavy rock-scape with some pieces of spider wood incorporated into it.
I was really inspired when I went to the Aquatic Expo in Schaumburg IL a few months back. One of the artists of the Nano aquascape contest was published for his work
The Mind-Bending Nano Aquascape of John Pini
I love the plants he used as listed below:
Micranthum sp. “Monte Carlo”
Riccardia chamedryfolia, Coral Moss, a darker green liverwort moss
Fissidens fontanus, Phoenix Moss
Bucephalandra sp. “Mini Velvet.”
So I would consider any of these types of moss if the lighting is sufficient or any low light plants that could be incorporated. Ultimately I'd buy a small co2 rig if need be. But I'm definitely open to suggestions if you guys have any ideas.