Try a slim porcelain sheet in a concrete look finish. The large format size means you'll probably need only one, so there'll be no grout lines. Have a look here, at the Portland 3.0. I think the Kerlite range also does a concrete look and is larger, at 3m long.
The other advantage of a porcelain tile over actual concrete, is that you just wipe it down. Concrete is porous and will stain.
Gallifrey
Aaron
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