Beautiful choices. I like the spa tones, like the SW Waterscape. I know the pain of paint choices. In the end, our painter helped a whole lot when we were building our house. Remember, it's only paint, and if you don't like it, you can change it.

Joannaca- I just posted bedroom pics on the decorating forum which has a color that may work for you. It is titled "need help warming up bedroom in cool color". Hope it helps. Love your tile.

I am in the middle of repainting a pretty large space due to a mistake with paint color. Although it is just paint, I learned quite a bit thru the process.
Buy samples of the colors you think might work (@$3 dollars each). Get some poster board, and empty shoeboxes. Paint a few pieces of the poster board in each color and put them in the room or next to the tiles you are working with. Painting the shoeboxes ( great tip I think from Parma) lets you see how the color will bounce off the walls). Painting little squares on the walls doesn't work.
It might seem like a lot of work, but an hour is worth not repainting an entire space like I am doing now :(

I have Palladian Blue in one of my bedrooms and love it. It is so much prettier on the walls. You might also try BM Gosamar Blue. I have it in my Powder room and it is a nice spa color

I used Palladian Blue in our bathroom and ended up repainting it because it was too green. I love the BM Ocean Air we have in our other bathroom.

How much surface are those 'accent' tiles going to cover? If they are truly a tiny tidbit of an accent I would go with Waterscape otherwise if the accent tiles are tasking up quite a bit of wallspace I would go with the Palladuim.

You ask if there is a "rule" to choosing paint colors and one is the 60/30/10 rule. So it really matters more on how much wallspace in comparison to the brown shower tile and how much accent tile is going in whether you try to go with matching the blue in the tile or the green. Also then the monkey wrench thrown into the mix is what wood tones are you cabinets going to be or are they going to be painted black, white or a color?

What do the 60/30/10 stand for? Duh.
Right now I'm leaning toward Waterscape.

The glass tile will be random groupings in the shower and on the backsplash behind the sinks. Haven't worked out the exact proportions yet with the tile installer but at $25/ft. it will be sparse. The vanity will be stained dark walnut with a Caesarstone White Quartz Reflections countertop.

I like the shoebox idea, but my children have used them all for school projects. I guess now I have an excuse to go buy some shoes!

I think you are on the right track indeed and either of those colors look like they would match those beautiful accent tiles. I agree with painting a piece of cardboard to try in the room. Plus if you paint a tan one to match your other tiles you will also have examples to use when shopping for towels and accessories. Sorry, I'm not much help on the decision except to say I am more prone to the lighter one on top that is slightly greener...just my preference.

I really like your tile. I also like the SW Waterscape with your tile. I have BM pike's peak gray in my sunroom.

Between the two I'd go with the SW Waterscape. You need a color that is saturated enough to balance with the tiles. jmho. Beautiful glass tile, btw.

I agree with Hudsonleigh SW Waterscape.

And I like the idea Kden 71 did painting the ceiling too.
Gorgeous.

In fact Kden71, I am stealing your beautiful idea this
spring when it gets warmer I am painting my porch celing.
Thanks for the picture.

~boxer