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Part of the reality is what resources do you have locally. Moss would be pretty hard to come by around here in any quantity and short of having a deal with a sawmill, generating a lot of sawdust could be an issue too. The underlying bedrock around here though is marble and limestone. Crushed limestone is what we use for driveway material, which if you are ever in this part of VT is why you see so many white driveways.