IMO it looks like someone used a bunch of left over tile for the floor so maybe take a picture from further back to show the whole floor.

A solid shade of white solid surface has never had an argument with a floor or backsplash.

Thank you for the comments. Indeed they are different marble tiles, but marble.

You can see the kitchen floor if you open the last picture. Here is another picture from the living room. The wall will be demolished.

Demolishing a wall = NEED MORE TILE! Be VERY aware of what you are about to put yourself through. Flooring does not run underneath walls. It is also possible the floors do not run underneath the kitchen cabs. This is often the case in N. America. If you are in Europe than you might have a different set up. In Europe it is common for flooring to run wall to wall - simply because owners/tenants must bring/purchase their own kitchen.

But I can guarantee the floors do not run underneath the walls. You will have a gap in the marble that will need to be filled. Please look carefully at what you are going to do to yourself. Do you have a plan for some other floor in that area?

NEED MORE TILE! Look for individual old tiles - ask the local masons about leftovers, sometimes there's "stuff out back". Also seek help from local shopkeepers as they usually know everyone. As for countertop material, real wood with a dark stain would "go" very well with any shade of white cabs and the tile. Doing a reno in Europe is a challenge but, SO worth it.

We will use the marble tiles from the bathroom that we are also renovating. The marble company that is doing the bathroom and the kitchen surfaces/backsplash already identified what kind of marble it is and can provide some extra in case we need. They will also polish all the marble floors.

As for the countertops and backsplash I like this marble but it’s a dolomitic one and they advised me against using it in the kitchen as it’s quite absorbent.

There's a lot going on in the marble flooring and I'd recommend looking for a countertop that is very quiet.