The Emser Classica line has harlequin tiles, but I believe they only come in cream or white. I've seen photos of white and cream alternating, which are kinda neat. We are using the Classica subways and some of their other tiles in our home. They are very nicely priced and they have a little bit of imperfect lines to give it more of a handmade look.

What are you planning for behind your cooktop or range? I think you could use enamel paint and caulk where the counter meets the wall. There's paint that can go over drywall tho make it handle wetness better. Or maybe put those sheets goods over for bathroom walls. Here are some other ideas. Alternatively, is there a way to have a natural break where the uppers end? This looks a bit weird, but maybe something similar? Look slike low backsplash all around and glass behind range. Maybe ask specifically how people handle L-shaped counters in kitchens when the wall continues into the room? There must be lots. I think most people just end either at the uppers or the bar.

We have walnut cabinets, a dark grey floor and stainless steel counters - very similar to your setup, but we have white painted boxes. We went with a handmade recycled tile, the debris series from fireclay. It was a fight to the death between a pale blue and a pale sage green, and a lot of discussion was had about format - 2x8 versus 4x4, etc. They have a lot of colors and formats to choose from. I was inclined toward white until it was all installed, and I realized that was too boring and the room needed color.

didn't have time to read all the answers. I have no backsplash and have never regretted it...been over 6 yrs. It is painted with BM matte...which has ceramic in it. It is as beautiful now as it was when first painted. I love the fact that I can showcase other things ...art etc in my kitchen and no competition. Also if I ever want to change it is as quick as a paint brush...expense is minimal..paint only ! All in all I think it is serene as you point out . Here is one pick. Since I have a lot of high heat cooking in my kitchen..built in deep fat fryer as well as gas cook top I can definitely speak to the longevity of paint only. c ( more at this album )