We need some help selecting a wall color to go with a multi-colored tile.

For our powder room, we're using the below tile as an accent wall behind the mirror and the more plain tile on the floor (Roca's Stratos Atmosphere). The tile is a combination of blue celeste, kays green and bardiglio marbles - so grey, blue and various shades of green. The ungrouted version is what our lot will look like, but we will use the same laticrete grey grout as in the sample.

Any ideas on what color would make sense on the wall? Our initial reaction was something lighter and more neutral because there are so many colors, but we also feel like powders rooms should have some color pop.

Any thoughts would be much appreciated!