We've used tongue and groove knotty pine for all the ceilings in the house. Despite recommendations to pre-finish the pine, we put it up bare, and it went pretty fast. We're still debating waht finish to use; obviously now that it's up, it has to be easy to apply....
Nailing the last of the ceiling.
Ceiling in the loft.
Looking across from the living room toward the loft and bedroom.