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Travertine is a pretty “famous” stone and was used extensively by the Romans to build some of their most famous structures (including the Coliseum). Since then architects have used it in many famous buildings (e.g. the Seagram building’s lobby).

Unless you are certain "this stuff in your own bathroom" is real travertine, it most likely is "some sort of synthetically generated random pattern". They make it out of colored cement, which is pretty similar to a real thing, but obviously cheaper and more resistant to some hardships of everyday life.

You’re right, it’s fake! A pretty good fake until I found 2 identical tiles.

Can you post a picture?

There are photos in the article here, mine looks identical other than the jaw bone.