Alternative materials for lining verandah ceiling

G'day all. I'm interested in using alternative (non manufactured) materials for lining a verandah ceiling. Products like cement sheet/villaboard don't appeal to me aesthetically or environmentally. Does anyone have any innovative suggestions? Below are a couple of photos of how I lined the extension to my verandah using garden bamboo screening. I'm happy with the look of this and it also provides a surprising amount of insulation. And it was cheap. My main concern is will it collect a lot of mould over time in the sub-tropical climate I live in. I may complete the rest of the verandah using the same method but before I start I would be very interested to hear from any one else who has used natural materials – in case there is a better alternative.

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