I think there is a missing element to architecture. Grass buildings, things that require grass, branches or twigs, grass binding of some sort.. ie grass thread, grass twine, and so forth.

Things like:

Sage teepee
sage leanto
sage hut
sage blind

things that would not be very strong but would allow for some additional recipes as well as something for the grassmen to use that would tie into their lore and RP element of the game.