Hardwood (sans bark) that doesn't rot easily. Cork bark. Tree fern fiber slabs. I have found grapewood, mopani, and cork bark at the pet store, tho mosty small pieces. It may be possible to find larger pieces tho - especially at aquarium specialty stores, and/or stores specializing in herps. Large rose canes are supposed to be good if you can find them.
Driftwood - needs to be cleaned - salt leached from ocean driftwood. Wood from conifers contains resins that the orchid may not like.
I'm sure more people will chime in with suggestions
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