Some other backsplashes I’m considering

These will be new cabinets

I would use a tile backsplash throughout--you can't put quartz as a backsplash behind a stove anyway, and using a partial quartz backsplash with tile in other areas sounds like it would be tricky to pull off well. Also consider the thickness of quartz if you'd be using leftover pieces from a counter slab--may not be the best fit for a backsplash.

I would want same backsplash for the aesthetic of the galley. It would be different if it was a stand alone alcove of sorts to pull off a different look, but it's not what you have. Backsplash isn't selected until after cabinets/counter has been installed anyway.

I wish I could see your kitchen... The counters are bit busy right now and it is hard for me to visualize the beauty under it all. What is on the other side? Is it an island? Or another wall?

When I look at what you have my personal feeling is to go as simple, clean, fresh and plain as possible. Tiles matching your cabinet in color and tone. Tile along that galley wall under the cabinets to the sink.

I would not use the slab as backsplash, I know, it seems like you paid so much for the slab of quartz and it feels like a terrible waste. It is not. Waste is part of the entire process. Like wallpaper or drawer lining paper or material for a slacks, There is always left over that can't really be used. If you must use the left over piece, maybe a garage counter or laundry room counter or donate it to Habitat for Humanity. Accept this loss and focus on finding the right tile for you soon to be beautiful galley kitchen.

If you have not picked and bought the slabs.. I would consider using a slab backsplash with another material. I did it and love it in my own kitchen.

On another note.. are you putting in new cabinets? The ones you have look new but it is hard to tell with the photo.

This is not your color but something really simple like this...

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I would also recommend using a tile backsplash in the entire kitchen, in the interest of cohesion.

I had a similar situation with marble tile when I renovated my master bathroom. Lots of extra 12x12 tiles. We saved it and then used it for the floor of a new powder room. You could save the quartz and use it in a bathroom/laundry room/basement worktop, etc. You never know when it will become useful.

@boxerpal here is a close up of the sink side of kitchen

Don't mix it...tile all! It will look hodge-podged! Especially if it's a galley kitchen.

Use the leftover materials in bathrooms, laundry, basement or wherever? Just don't be surprised how $ it is to fabricate.

Thanks all we will go with tiles on both sides

No quartz behind a range ever so simple all tile .Please use the DW before taking pics .

oh, relax, Patricia.

but... where is a picture of the quartz? this seems like a hopeless question without it!!