I have a suggestion but not for a light gray. Small bath…go dark.

Hello, Since you are planning on keeping the vanity cabinets with dark granite countertops along with white subway tiles, I think an easy solution would be to bridge the gap between the countertop and the subway tile by using a white marble look floor tile with dark veins. Below are just a couple of tiles I found on Houzz. I think using light-colored floor tiles would keep the bathrooms from looking too small or dark compared to using darker floor tiles. Are you also planning on painting the walls? I think painting the walls in a gray color would be also a quick and inexpensive way of making sure the whole space looks good. The current paint color looks like it's on the yellow side and I think your tiles, granite countertop, and the brown vanities would definitely look better if the yellow walls went gray.

Need to post photos of the whole bathroom.

@Jean thank you for the info, which I appreciate. I'm in Canada and only 1 of the stores that sell them is anywhere near me, I phoned them and they only sell to stores. plus, if @Diana Bier is correct about prices, I'm looking for something more affordable, but they are definitely gorgeous! Thank you all for your input, which I appreciate very much. I ended up going for a light aqua (sherwin williams Watery at 40%). I know in the pictures it looks more blueish but it has some green in it too. I'm very happy with it (very spa vibes!) but am wondering what do for my built in niche near the toilet : 1) do I keep the inside part wood (that I would stain) or paint it white and 2) what would you do as a background : wallpaper? See pictures below please Thanks in advance :)