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Wonder if you could use architectural copper sheet, the stuff on a roll.
We have a copper work surface and splashbacks. You can't use the stuff on a roll, you need flat sheets. Our Polish builder imported the sheets himself from Poland in his van as it was cheaper than buying it here.
It looks great and it's super practical too (naturally antimicrobial) but I wouldn't have done it myself because I think it would look shit. It was expensive and had to be glued to the ply with a special glue because most glue doesn't work on copper. @TooTallTim may have better DIY skills than me.
I think brass is less fussy about glues.
Wonder if brass or brass colour....Part of me thinks that brass door kicker plate in a tiled formation would look good. Wonder if you could use architectural copper sheet, the stuff on a roll.
Personally I like the way brass slowly ages green.