I am aware this is just a low decoration thingy, low on the list of priorities if Jorb even likes it, and probably not practical in the real world (but this is a game right).
1) Could we have roofs make of bark ? - particularly on the smaller buildings where we would be able to use bough anyway.
hmm another thing that is doable in the real world and i've even seen new buildings here with that sort of roof.
2) Living roof - growing stuff.
Dirt and seeds could be added when building, bark or bough/tarsticks - so people can choose which type to make. - or the roof grows like natural habitat area.

