Without photos of your tiles, it is a hit or miss, but I see neither sage or blue.

How about B.M. Cumulus Cloud?

We used BM 1576, Ice Cap, which picked up on green shades in a room with green carpet but also looks blue in a room with pale blue carpet.

My apologies, I don't know how to add a picture.

Is it obligatory to mention Sea Salt? ;)

Depends a lot on what you mean by your color names -- "sage" can vary from a pale apple-ish green to a very gray green. Similarly, light blues are all over the spectrum. I think you're going to need to go to a paint shop and bring home a bunch of chips, and narrow the field a bit by what goes with the color tones of your stone and tile. Then get samples of the finalists and paint them onto poster board and see which you love.

We used SW Silverpoint on our bedroom walls. It's a very light greige with a sage green hint to it. I like it because it's not minty. It's quite subtle.

Of course the way you see colors really depend on your lighting, so be sure to have your lights installed and do some sample boards so that you can see what your samples look like in your actual space.