I have a room with knotty pine walls and knotty pine vaulted ceiling. What color of hardwood can I put on the floor?

Honestly, it's all up to what looks good to you. However, if you want a similar color, you might consider cork. It's a green product, and it's extremely durable.

Well, they do make pine flooring; but having the room 100% pine might not go well. (and softwood flooring does not hold up well) if you have a different wood for door and window trip, you might consider that color - or you might think about a smoother finished stone.

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