I dont' see anything either, the tile looks like it has some bluish threads in it. It looks very organic and pretty. I wouldn't change it either. I love the blue color of the walls and in a few years, when you are tired of it, you can change to something else and have a ton of options but I think it looks good.
I think I'd need to see a wider angle picture of the tile with the wall color in the picture to get a feel for what you're worried about. In those two pictures I'm not seeing anything particularly troublesome. Or anything pink?