Thought I'd share this idea for anyone who does live in areas conducive to keeping orchids outdoors. I don't have a whole lot of space for pots everywhere at the moment (although they still seem to creep into every available space :P ) but I do have this tree on my property. Last year I decided one day to just stick a whole bunch of spare plants all over the tree and see what would stick. They've done about 18 months there now and are starting to stick to the tree with their own roots and most are now putting out new leaves.
I have attached Dendrobium speciosum, a yellow oncidium, a Miltonia, a Liriope, an Osmoglossum pulchellum and my mystery red leaved Dendrobium. Non-orchids on the tree are 3 tillandsias and a Staghorn fern.