Here's some backsplash options I'm looking at

fix the lighting..1. see if you have the max lumens in the ceiling fixture..i think you could go higher lumens. 2. coordinate a fixture over the sink to work w the ceiling fixture better . 3. there is one puck of light that reads yellow under a cabinet...you want to address any problems w function w the strip or pucks and get that illuminated better. Id leave the backsplash for now because i would jazz up the dining zone even more..its lots of fun there...a rug. w some mats to coordinate in the kitchen maybe a bold tangerine wall color to the left of the wallpaper [note the toss pillows] .....if you go for a backsplash I'd do white subway honestly. because between the 2 areas there is so much accesorizing you can be doing.....my notations are just a start.

Found this during a search of "vintage 1970's backsplash". It's not bad I think.

I would do green subway tile, but you seem to be leaning toward black and white. The checkerboard pattern is too much for my taste if it's all over, but I can see it behind the range in a white field.

There was nothing charming about most 1974 backsplashes! ;-)

1970's it was wallpaper....scrubbable was a big deal....wagon wheels/ roosters/ barnyard stuff birdies and sunflowers. innocent enough.

I like Norwoods suggestion. You still get the diner vibe but toned down. By the way, the wallpaper is hilarious! Love it

Your seating area is fantastic. You clearly understand style. I think you can cook up something better than any of the suggestions given so far and better than your samples below.

Thank you all for your insights so far! In case the photos weren't clear, the counters are black granite, and with the natural stone come back we don't plan to replace them any time soon. The new backsplash should hold us over 5+ years until we can do a larger layout update (we're not planning for resell so we can have fun with it!) But the black counters are why many of the backsplash options I included have had black to try and tie it together. I like the idea of the mint or green tile; but I am unsure if throwing in a random color will work with the black counters and white cabinets.

Oh and we already have a coordinating light fixture we plan to swap out above the sink (the larger one in the middle was just changed.) Agreed we could consider higher lumens since there's not a ton of natural light depending on time of day.

Go simple and classic. A white subway tile with light gray grout.

Then, do the fun vibes with wallpaper and art.

If you are really just buying time, why do a whole tile installation? Consider using a 4” solid surface (Corian) backsplash in matte black. It will be inexpensive, it’ll look like it belongs there, and it will be easily removed when the time comes for better things.

You have beadboard cabinets (which I love). Why not go with beadboard backsplash? The backsplash isn't really an area that "gets splashed", so wood will hold up fine, and it'll cost you about 10% as much as tile.

You have an example of a beautiful Mint green in cabs in one of your inspo photos and it pairs with the black counters and white tile for sure, so that shade would be great for a green backsplash.