Most people end up regretting choosing a color as a major bath fixture. It ends up being the dreaded "blue bathroom" that drives so many to redo it.

Therefore, I'd say that white would be the best choice for the major portion of the field tile. But, there's nothing stopping you from using some color as maybe some liners or a decor running through the shower, and possibly the shower floor. But, that is only if you plan to keep the wallpaper for a long time, and would be OK with locking yourself in to something that goes with the permanent element of color. If you want to play it safe, then maybe something in a gray with a lavender cast to it for a deco, mixed with mostly white.

I looked at over 200 houses when I bought my house 20 years ago. I still remember all the different colors in the various bathrooms. I would question over and over again, "Why? Why? Why? Why did they use (insert any color here) instead of white?"

It's easy to tone down a lot of white in a small room. But what're you gonna do with turquoise or lavender or pink or green tile or tub or toilet? Even if it's only some of the tiles, it would still have to be replaced (for me).

I saw $$$$, when I saw bathrooms llike that, because it's expensive to replace tile (although now I understand that some of the resurfacing methods work well).