Thought I'd share photos of a greenhouse orchid display I built last Fall. It's about 8'Lx3'Hx2'D. There is a water feature and a small 'pond', but the main attraction is the epiphytic orchids, of course.
Below are photos of the construction and finished work.
The gray/black material is polyurethane spray foam (Handi-Foam) and polyethylene foam. The foam in this sequence is sculpted, coated with tinted non-toxic epoxy (#1319, Polygem brand) and coarse sand, then lightly painted.
The Background is polyurethane foam that was carved, then coated with black silicone (acetic acid solvent). To the freshly applied silicone, a mix of Medium Tree Fern Fiber, Fine Fir Bark, Fine Activated Charcoal, Ground Sphagnum, and Peat is firmly pressed. The same mix of ingredients is used for the terrestrial substrate, as well, but heavier on the course material.
The first plants added were bromeliads/Tillandsias and a small tree fern (Bechnum gibbum, I think). The orchids, other epiphytes, terrestrials, and aquatics were added over the course of about two days.
After a little time acclimating and water clearing (got to love the loose clay in Fluorite!):
The front faces east and there is supplemental lighting above, consisting of 2 48" 2X65W CF, 2 6,700K & 2 10,000K bulbs. There is also a small 13W (I think) spiral CF behind the buttress.