I agree that off white in a herringbone pattern would look nice.

I think you have a lot of white. I would go w/ something more the color of your floor to be darker than cabs & lighter than beautiful countertops. Our bksplsh is 1x2" porcelain tile in herringbone pattern in color close to your floor. You can also get beveled 3x6" subway in crema marfil marble. That's what I wanted but wife &CKD out-voted me. I don't know if marble comes in smaller 1x2" sizes. That's an inherently dark wall, so I wouldn't go too dark. And w/ that long wall, I'd add undercounter LED strips, if you haven't already. They would not only illuminate the counters, but would add neat effect.

I concur that the subway in a herringbone would be nice. I think you could use white or a tan color, maybe just slightly lighter than your floor, which would tie it all together. Or white tiles with grout the color of your floor.

White subway would look nice.

I love your floor tile, what is the name and manufacturer?

Thanks for all the great ideas!! The tile is from Olympia tile's regal collection, The colour is light mocha.

Here is how the white subway tile turned out.

If you look at the most recent pic there is already a backsplash. With such a busy granite we wanted to choose some simple.