First, I think your kitchen remodel will be a big success! Very nice. I have a couple of suggestions. First, the striped rugs appear that you are "forcing" the floor to complement the gray cabinet. I wouldn't put any area rugs down and keep it "clean". Then, be sure the backsplash will complement the travertine floor and also the marble look counter. BRB

12.06"x12.06" Sadie Mosaic Wall and Floor Tiles, Travertine Marble, Set of 10 · More Info

I too was thinking a simple subway tile but couldn't find a nice one that was complementary to the counter and floor. I vote classic subway too.

No travertine on the backsplash, the colors will clash horribly with those counters. The floor is wrong for the space, but it's there, just ignore it. Hard to see on monitor, but of those tiles, I would be the lightest warm gray one. Another option is to look something brighter like a mother of pearl mosaic.

Tiles #2 and #4 are the only ones to consider.

A bright white subway tile would look great as a backsplash. Try one like this thats kinda a twist on traditional subway tile: https://tilebar.com/lori-dennis-mesa-blanco-5x12-ceramic-tile.html?gdffi=007c33964f424d48a7ad54207c9a96af&gdfms=918F756B741F4BC09CB4FD2B9FE8F4AD&gclid=EAIaIQobChMIwt7a5Y7e3QIVTl8NCh042g6TEAYYASABEgKeGfD_BwE

First, you have to consider these on the plane they will ultimately be. That means tape them to the wall above the countertop. Looking at them flat/horizontal instead of vertical will change your perception of the outcome. I think the long more narrow tiles could be interesting. Were you thinking herringbone? Those with a light grey grout might work, although the herringbone pattern is busy but with calm colors could work out. I will look for some photos for you to visualize that look. bbl

what brand is your cabinetry?

I'd do white with white grout. Maybe arabesque or plain subway white with herringbone over the stove top.

maybe the kitchen wall is all white, and the other are all most of white. a little like white cream..

what about some more active tiles? just like this.

or some special white natural pearl tiles.

simple but nice

if u love it, pls contact me:)

hope u have cozy home.

:)

If you are going to use white, pick the one that works best with the cabinets; they will be seen on the same visual plane. You don't want one of them to look dingy in comparison.