[CCR]

I think I would have opted for a nicely color stained, sealed concrete surface. Granted they would have long term maintenance issues with waxing and re-sealing every couple of years or so, but it would have been breathable until the end of time.

[CC Solutions]

Maybe a polished and hardened floor?

[CCR]

...another viable option for sure

[eaadams]

oh... static disipating, heat welded ... well there are few manufacturers of those. Most are private labeled coppies