What to mount on tree fern?

[Rothrock42]

I've got a couple pieces of treefern medium that I'm trying to decide what to mount on them.

One is a 5 x 6 inch slab and the other is a 2 inch pole abut 15 inches long.

I recently moved my orchids out of the house and into a greenhouse. This makes it much easier to water mounted orchids. So I'll be moving some plants that might do better out of their pots.

I also have several large pieces of oak bark which I can use for other plants. Mostly I'm looking to mount coelgyne or dendrobium. What have you grown on tree fern bar?