It would probably help if you post a wall colour as well.

Your cabinets and counters are lovely. The granite has a very strong pattern so I would keep the backsplash very calm - neutral, solid colour. If you use tile, try to avoid busy grout lines. Avoiding stone or stone look, which would compete with your counters.

I found W Zanger tiles were a pretty solid tile, with a huge selction of colors. I posted just 1 picture, to show the tone differences between a similar color. With your ovely wood, and the strong pattern of granite, I'd go simple.