We had a really difficult time ridding ourselves of all the tacky 70s remnants in our house. Our "backsplash" was was wallpaper--little brown teacups. I lived with it for a long time. We weren't ready for the whole kitchen renovation, and putting up another backsplash would have meant removing the laminate countertop, so, guess what--we did exactly what you did!! I saw those tin tiles and we used those. They worked great, and I really liked the look!
I think yours look fantastic as part of the tub surround. But then again, great minds think alike