Posting pictures will help
But you really should wait until the entire space is complete to work on your backsplash.

Some options can include :

Continuation of the countertops.

Plain white subway
Or
Long white subway
Or
A very long white subway almost giving a ship lap effect. Which I love

Subway sized marble tiles

Herringbone pattern

Picket style

Options are ultimately endless!! Show us your space. And your inspiration for more detailed suggestions.

Thank you. I like your suggestions.

Does it matter if whites are different? What is ship lap?

Yes it will matter if the whites are different, I therefore recommend/ed waiting to sample some tiles in the finished space.

I will show you some shiplap looks
AKA tongue and groove.

Here are a few.
It’s probably best to either get an elongated tile.
Or avoid having the wood near the stove ( as shown in one of the photos ; it actually incorporates the other idea of continuing the Countertop material...)