I would change out the lights to simple pendant lights. (NO Bare bulbs showing)

I would probably paint out the ceiling and walls with a duller white more of a gray so there isn't so much contrast to the tiles.

... if you could grout over the tiles with white (Avalanche) it wouldn't draw as much attention to the tiles.

Sue, what is a vastle?

Of all the tiles, I like the wall tile the best. I would paint the walls the same color as the tile, as mentioned, and I definitely would change the sink counter to something plain and paint the vanity white.

Supposed to read Bathroom Castle!
Friend made that comment. Looks more like a dungeon, which isn't the look I was going for!

It's really unfortunate because your floor is gorgeous and the other elements are so nice. The good news is that it looks like maybe you don't plan on glass doors, but a shower curtain? If so, I would find one that you absolutely love and keep it closed, which will limit the impact of the tile that you can still see.
I would probably remove it from around the vanity, since that won't affect waterproofing and just have paint on that wall with more of the vanity tile as a backsplash (or leave one tile high). On the end of the wall that you see when you enter, you could add some metal (look) Command hooks, stacked, and hang bath towels to cover some of those tiles at eye level. That's where I hang towels in my master bath and the hooks have worked well for 10+ years.

Thanks, Sue. I'm glad I'm not the only person plagued by spell-check! 
I'm sorry you don't like your tile. I hope some of the suggestions posted help you out. I do like the idea of painting the walls a light grey.
It really annoys me that you were pushed into such a serious decision too quickly.

Sue and others....had a thought...would painting the walls grey just pick up the grey of the tile edges even more than now? What do you all think of trying either the blue or plum (?) Color from the tiles as a wall color instead? Of the two, which would be more likely to make the grey in the tiles be less noticable? The plum? And what about painting the doors a complementary warm color from your tiles. Can you mount a mirror inside the door frame? What about the door we don't see?

I agree with all the others…I think the contrast between the wall/ceiling and the tile is the disconnect, but I would paint just the door and trim a tile matching grey and then find a color in the floor tile, cut it with white until it was very soft and paint the ceiling with it. But also once you add your towels and stuff those items will soften the cinderblock look

We agree that painting the walls and doors the color of the tile should help this dilemma. Notice our floors and walls in this design of ours and how they connect and go together well.

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Painting the walls a light gray and I would want a oil rubbed bronze oval mirror

I agree with the others about changing the wall colors, possibly even trim & door. I actually DO like your tile choices and hopefully with the paint changes, you will grow to like it as well. I also like the idea of changing the mirror to one with a frame.