Whew, finally a response!
Hope you did not give up on orchids.
How about something like Bulbophyllum vaginatum.
In nature it grows attached to tree trunks and limbs so it will grow well mounted on various substrates such as cork bark, driftwood and tree fern fiber. It requires warm humid conditions with light shade. Will grow well under fluorescent lights.
The leaves are up to 3" long and the pseudo bulbs are about 1/2" in diameter. The flowers vary from cream to yellow and look somewhat like mop heads.
