I've been planning on using a coconut shell as a pot. It's a half shell with all the husk removed, so it's not quite the same as what you've all been talking about. I gave it a rough polish and discovered a beautiful star-like pattern on the shell, so I drilled some large holes in it to use as a pot. I think I might glue some struts on it for stability.
Hehehe, guess what I plan to put in it. Maxillaria tenuifolia. Can you think of a better place to put a coconut orchid?
I'll post some pics when I get home from college of the "pot" and the chid, and when the chid is actually in the shell. I also need to raid the computer back home for pics of the few orchids I've gotten to bloom so far.
I'm wondering what kind of medium to use though. Unlike coconut husks, the shell won't hold enough moisture or nutrients on its own. Right now it is in a 2 inch with a fine bark/perlite mix, in an east facing window. Any suggestions on mediums?