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looks like 6x12 glass with texture design
small view on the left side of photo- looks like a light travertine (probably 4x4) with a lagos azul (dark brownish grey) diagonal insert for a little more color
This is the windemere with a similar flooring pattern you're going with- looks like they did a small backsplash of about 3" and then painted- I love this paint color to correspond with other elements you've picked out
here- they went with a ceramic cream 4x4 on the diagonal- looks really clean and keeps the area light!