I would recommend either the middle painted color or the painted board that is sitting on the toilet. Bring the blues or dark taupes in with towels and accent pieces.

Always remember to test paint in multiple locations in a space before committing to it!

The colors you've chosen are all so subtle (I love them) that it is hard to advise by look at my iPad monitor. How about matching the lovely sea foam glass, or it it light grey? At any rate, I would try to use a paint color that is close in shade to that glass. It will make the bathroom look like a soothing spa.

The shade of dark grey in the tiles would be my pick

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See if you can find a paint color that's close. Test it on the wall or White poster board in the finish you plan to use, either semi gloss or a matte that is made for bathrooms. Benj. Moore Aura Bath and Spa is one. Either finish would look good.