It's all about slate!

slate

Millwood Pines Gutierez Skimmer Slate Small Cover Rock Statue

slate

slate

Premium Black Slate Panel 6x24

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slate

slate

Eternity Flooring - Black - Porcelain Slate. -- Lighter grout

slate

MSI Montauk Black 12 in. x 24 in. Gauged Slate Floor and Wall Tile (10 sq. ft. / Case)-SHDMONBLK1224G - The Home Depot

slate

slate

Slate tile texture by ThreeDiCube on @creativemarket