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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.
Fox-
https://basiccopper.com/thicknessguide.html, seem to disagree.
This is from the link as I was thinking about copper splashback would be easier/cheaper than brass to work.
22 Mil/16 Ounce Copper (.0216") 24 gauge: 16 ounce copper sheeting is a heavy weight copper often referred to as "roofing copper" or "roofing flashing." It weighs approximately 1 pound per square foot. It's often used for roofing and flashing, various art and craft projects, DIY projects such as copper backsplashes, copper countertops and copper range hoods, electrical applications, research and development and much more. 16 ounce copper can be bent and formed by hand but is very durable. Metals snips are needed to cut this thickness. (Also check our patina copper sheetsfor a variety of uses including bartops and countertops. It is also used for for various wall hangings and artwork.) See a video thickness guide of 22 mil below.
lynx
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.