First thing to do is make sure you have the optimal efficient layout. Even if you think you do, I'd strongly recommend posting it here. The folks on here saved me from a huge mistake, had I gone with the design of the "highly recommended genius architect" that I'd hired to design my kitchen.

Start with undermount lights, as wiring might have to go behind the backsplash. I think the 3rd tile on the black sample board goes well with the countertop next to it. And combines nicely with the blue. The swirls/pattern on the photo below is too large and would clash with the woodgrain (in my opinion). White tiles would be too stark.

I’ve seen the Silestone Calacatta Gold in several “I hate my quartz” threads, and I agree. It’s not attractive installed. It looks like a child’s drawing of marble, lots of huge fake veins that never line up and look stripy. There’s an active thread on this right now, I believe. The Viatera Muse and Minuet I have heard less about, meaning there may be fewer complaint threads on them. They certainly look more subtle. The key to choosing the right backsplash for these types of counters depends a bit on the color of your cabinets. Are they white or wood?

A paintable white. Then paint it when you paint the walls.