Boy, I'd think it would need to be pretty impressive match to look good next to the real thing. I'd go with something that loosely coordinates, like a solid.

There isn’t much floor visible. It’s a small room. I tried several different solid color floor tiles and it doesn’t look right. Maybe because I’m used to seeing the existing flooring which I think is travertine (it’s chipped and doesn’t have the depth of marble).

You'll have to get samples. some are on the taupe side, the yellowish side, the pink or the creamy side

Tilebar has these, diff sizes

https://www.tilebar.com/basic-marble-crema-marfil-12x24-satin-porcelain-tile.html

Bedrosians has some too

https://www.bedrosians.com/en/product/detail/crema-marfil-select-tile/?itemNo=MRBCREMAR1224H

https://www.homedepot.com/p/MSI-Crema-Marfil-12-in-x-24-in-Polished-Marble-Floor-and-Wall-Tile-10-sq-ft-Case-TCREMAR1224SL38/302073543

prob the same as Tilebar, but they carry it under IvyHill over at Home depot

Crema Marfil is very creamy and warm. It would look great with terracotta tiles.

I would have to agree with the Dal tile Marfil from their Florentine collection. Its really nice. If you look into Happy Floors, they have a tile - Pietra D'Assisi that resembles travertine. Merola also has a nice looking tile from their Florencia collection that may work well.

Good luck!!