Look at Susan Jablon for custom glass mosaics

https://www.susanjablon.com/

Thank you for the suggestion, I am pretty sure it is not from Susan Jablon.

I put a very similar backsplash in my last kitchen - a custom blend from Susan Jablon. Even if that piece was not one of her creations, I am certain she could recreate it for you.

I was going to use it as a border around this wallpaper: Salon Wallpaper

i sent a request to Susan Jablon to see if they can recreate, thanks!

In a powder room? The wallpaper doesn’t need any embellishment.

I agree with @Carolae. I think a "less is more" approach is best when you're working with bold wallpaper.

If this is going in a bathroom and you need a backsplash, I'd do a simple 4" splash out of the same material as your countertop.