Use the counter material for your backsplash!

I don't think the size of floor tile and shower wall matters. I did 24x24 on the shower walls and 18x37 for the bathrooms floor, but this was for my master bathroom 8 years ago and there weren't too many larger reasonably priced tiles. Lots more options these days for thin tile material in much larger sizes. Most of the ones I have looked at have 30x30 , 30x60 , 24x48 , and even larger ones, but then you get into making sure your installer knows how to handle the really large ones.

You can find tiles that are 60”x120”. They are not too large. If you can find the right fabricator. You have to conser the overall when making your selections.

I like those ideas for the shower. Thanks.

What about the kitchen backsplash? How large is too large? I can't use Sea Pearl quartzite (my countertop) because my fabricator had to redo a 10ft section of the quartzite I had chosen, so to replace it, he chose a cheaper Sea Pearl that had a different texture and a different color to it. So, I have 10 ft of the mismatched quartzite, three ft of cooktop, and 2 ft of the original quartzite which matches the island. Impossible to match the quartzite on both ends of the counter.

My contractor and I have been trying to decide if he can use 6"x12" glass tile for the backsplash, but we can't stagger the tiles where we wouldn't have 1/2" slivers of a U shaped tile. We both think it will break. If I could use larger tile, it might help.