I have an open floor plan too and we just went with an off white color then use the room accents for color.
My only complaint about the floor plan is that noise travels and my house always seems loud!
Other than that, I love the open feeling to it...like the whole house is one big area.
We have one door that closes off the master bedroom / bathroom area and the rest of the first floor is open living space.
Good Luck finding the right color. I'm sure when you see it...you will know what will work in an instant!
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