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 :)

hi my husband is a builder and I know about tiles a lot . there is nothing for wet area tiles . all tiles are floor and wall tiles. yea you could use rough surface tiles in wet area but it's depends on your style but you don't need to choose only rough surface . in wet area you must have to do waterproofing before laying your tiles . you can all choose from cremaic tiles to porcelain tiles. you just need to measure wall hight and width then tiles shop guys they we will work out how many sqm you need or give them your floor plan they can work it out.

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.

I assume this is the photo that you have referenced. I googled yellow subway tiles Australia, and came up with these. The website is showing yellow tile with dark grout, but I think it is a similar hand made yellow subway tile, as the one in the overseas photo with white grout.