A few of one. A LOT of the other.
a quandary it may be, but it sure is a good looking one!
I have similar toned tile in my bathroom, and although I can't quite see the color in the "wave" detail, we did ours in a lovely pale teal/aqua.VERY pretty. Feels beachy and fresh without being too "seaside" (e.g. no containers of shells, etc.).
Oh, fine...on the "Who Has The Better Bathroom Remodel" scale you win. Okay? Happy now? And throw some color in there already!
BEAUTIFUL bathroom! I would choose a muted, milk choc. brown. However, I don't know what the rest of your house looks like. :)