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 :)

I bought similar for the new bathroom, not marble but look fantastic with light grey grout - this photo is not grouted yet but you get the idea. I looked at marble subway tiles for the walls but cost was prohibitive. Go for it if you love them (just noticed the date, you've probably decided by now ;)

Hi Kirsty, could you please advise the colour of your vanity and whether it is a custom made one and if not, could you let me know its name and where you bought it. Also, what is the colour of your floors tiles and where did you get them from. (I have come to the conclusion that charcoal/dark grey tile plus a much lighter grey tile plus white on some walls plus a timber vanity or timber accessories in bathroom , plus white (or close to it) below sink counter top is the way to go for a beautiful bathroom. The trick is figuring out exactly what proportion of each colour to use and where to put them for each particular layout.

How big are the floor tiles? It may look unbalanced with a more delicate tile in the floor and the 600x300 on the wall. Are you able to continue the flooring tile up at least one wall for cohesiveness.