I love those long floorboards/wood-look tiles and they are the feature so you wouldn't want something too busy on the walls... personally I would go with a larger format say 300x600 rectified edge white tile with a matt finish for the Hamptons look... what's your vanity?... a timber one would tie in nicely with the floors and all the white... very Hamptons :)

Is your final photo of the vanity you already have? I also thought adding legs would take it back to the MCM you are after. Would be interesting to know how the silver drawer pull is attached. Not sure about painting it matte black as I thought timber furnishings were more prevalent then, but it's totally your choice. I hope you will post updates as you go. I just love mid-century.

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Hi Maria, I see what you mean as I too had blackbutt floors laid and was surprised to see mostly red and not the lighter blackbutt that I was expecting and I have grey floor tiles that butt up to the floor as shown here in these two photos. The difference being that they are two separate zones and yours is one zone. I would suggest a lighter grey on the walls and perhaps a mirror above the basin that has the same wood tone above. Everything then should compliment each other.