Goodness, my bathroom won't happen if I don't. The floor is slate and getting a grey grout to blend in. The wall tile, though not yet chosen, will be much lighter and will necessitate a lighter grout. I think choosing the right grout for the tiles is better than trying to use one color for the whole room. Find one that you like for the walls, it'll come out great.

I might be using Crossville's Virtue throughout the whole small bathroom. I was thinking of using their hex with a darker medium warm grey on the floor, and matching grout everywhere else. Also considering using their brick in half height with a little darker grout and then a matching grout on the same tile in the bath surround. There will be the shower glass separating them. Would it look better all the same grout? Wanted to delineate the brick but didn't want a grid patter around the shower. Floor will be a medium taupey color if I do that scheme.

Well since so many people replied to this thought i'd provide an update for those who might care. Contractor stepped up and agreed it was his fault and dug out white and replaced the gray. I like it a lot better. It does show the imperfections that you don't see with the white but i prefer the tile definition and think it goes better with the gray walls.

For some reason several notifications popped up today that I never knew were on this thread or a couple others. I thought it may be helpful to some who may read through this (and reassuring to those who were concerned) to see in first two photos the watertight way the shower was structured, then in last two photos are the colors of grout/what I ended up doing (per my original purpose of posting this question on Houzz) : ^^^This red/pink stuff is the waterproof material that was put all over the shower/in niche/etc before the tile went on. And as I had mentioned in prior comments, a large curb was always the plan as you will see in this almost-finished photo :) *Note: The unfinished window is a reflection and not actually in the shower Finally, for those who looked at this thread in search for answers to their own questions about grout colors, I went with Tec Dove Gray Sanded Powergrout on the floor and niche (wherever the hex was), and Tec Silverado Unsanded regular grout on the walls with Powerboost added (to make the unhanded grout a form of Powergrout) on the walls...choosing the lighter gray to soften the bright white so that it would work better with the warm white vanity. The Powergrout has posed no issues whatsoever in the last month since the shower has been used. We did seal the floors/walls for additional mold/mildew/stain resistance. This is a good representation of what the colors of tile and grout look like in reality...the Dove Gray appears a bit softer in person though.