I couldn't see the product cause their site is down for maintenance right now, but Ulla Jurrisen (who owns Kelley's Korner Orchid Supplies) has a great fogger/mister set up which she always uses in her show displays. This is from February. It isn't a great photo but I think you can see the mist coming out around the edges of it.
If you go to their site, you can see the components that they used to build it. I have talked to her about it a little. I think she keeps it running all the time in their greenhouse and the moss just grew. At each show, she just "decorates" it with little mounted plants and other miniatures. It think there are some plants that grow on it all the time. It's pretty damn cool, if you ask me.
I don't think that exactly answered your question, but maybe it will keep you thinking about such a project, Zach.