The real question I always think is:
what effect do you want to achieve?

Meaning there is no "correct" color, it's all about what you like or don't like, the rest is about finding the right shade of the color you choose.

Do you like both these colors? Or just one?
Do you want a high-contrast room? These colors against white will 'pop' and have more of an energizing impact.
Or low-contrast? A muted version of either of these colors will make it seem more restful.

If you look at basic color theory:
http://www.colormatters.com/colortheory.html

Imagine the opposite of either of those tile colors, in a shade that's about the same tone or visual weight as the tile, on your walls.

Then imagine the colors closest to those tile colors on the wall.

Do you like either one better?

And tile is paintable, so if you don't like the colors, there are specialty paints on the market that cover tile beautifully (I even used them in my last rental, on the kitchen counter and backsplash). Though regular latex can be used, it does Not wear well in a wet environment, so seek out paint for tile specifically. You etch the tile first with an acid product and then paint the tile, yes I did regrout, and it looked like a brand new tile job.

Have fun with it...

I have that exact same tile in my bathroom (minus the yellow, my floor is white, and my tub is minty green). I painted the walls kind of a sandy brown color. Looks good, I'll see if I can get a picture.

Dark chocolate brown!!

If you continue the yellow up the wall, it will become a neutral and the seafoam will be your dominant color to accessorize around. Your accessory colors than run from a paler seafoam up to a darker green in the same family, with maybe a greenish-gray thrown in. Ideal art work would include these colors plus a tiny pinch of violet. (I'm not sayin' "match the art to the sofa," but I am saying, "deploy strategically the art you like anyway.")

If you match the seafoam, that becomes your neutral, and you get instant wall graphics from the yellow pattern of tiles. You're now looking at yellow and white towels, and your "tiny accent" color becomes orange or peach.

If you choose a soft color that's halfway between the seafoam and the yellow, you get a very coordinated analogous color scheme. It would be improved by any sort of pattern that incorporates all three colors; towels can match the three colors, be darker shades of them, or be white; and your "tiny accent" can be any warm color.