Your kitchen is transitional in style (flat doors, provincial handles etc) so you have a number of options for your splashback. You don't have a huge area to cover - you could get your stone mason to use the same stone as the benchtop. A glass splashback would also work well. As for tiles, you could try the provincial subway tiles that are slightly irregular/rough to match your handles.

Before deciding on a colour, don't forget to consider your kitchen cabinetry, benchtop, splashback, etc (and dining furniture)... for example, if you have a classic hamptons (farmer style) kitchen (and furniture) then don't discount a warm white for the walls... it won't look clinical as the warmth will come from the kitchen cabinetry, etc and dining furniture, e.g. But if you have a "hamptons inspired" look with a slightly more contemporary kitchen cabinetry (and furniture), then in my opinion (all nice options above but a bit too beige'ish for me) so I would suggest a light shade of a warm grey e.g. Whichever way you decide to go, try to narrow it down to 2-3 colours, get the small pot samples and paint each one on all the applicable walls as they will all look different at different angles depending on how they reflect natural daylight and the lights at night time... then you may be able to make a clearer decision. Good luck! :)

I think stay away from grey, you need towels that pop. Mint and lemon, even fluoro orange (I know, I know, it sounds ghastly) but Aura by Tracie Ellis have a divine range of beautiful geometrics, not block colours. This is the only example I have on hand, but I featured the collection on my website. Just gorgeous. http://dontcallmepenny.com.au/new-aura-textiles-for-bed-and-bath/ Have fun choosing now. Cheers, Penelope

Lots of lovely options available. I’d play up the green and blue already in your palette, and perhaps add a bit of interest with a pattern that appeals to you. White with these colours would look very swish, too. Choose your fabric very carefully tho, and be prepared to a bit more careful with it/them to keep that crisp look