How about rock look tile? But, you'll need to add accents in other areas as well to tie it together.
https://www.houzz.com/photos/1906-earthquake-cottage-master-bathroom-contemporary-bathroom-san-francisco-phvw-vp~130378

second pic

I see your problem. One thing to consider is you need to keep the level consistent. Are there walls at each end of the vanities? Are the vanities installed completely now? If not you could use a floor leveler compound tinted a different color to bring the floor levels the same. If you do that don't try to match. Make it an obviously new color.

Whatever you decide, I'd suggest replacing the two rows in the commode area with your selection to keep continuity.

i thought about the rock tile. i am not sure how to tie it in though

I see they are finished. I agree with bite the bullet. A lesson in planning learned.

yes. walls at each end of the vanities will a small space in between. the vanites are not fully installed. we knew we would have to pull them out to do the floor.

Too bad you don't have extra tiles from original install. I would rip it out and start from scratch .