The other side of your bathroom will be beautiful. So let's try to fix this side. I don't hate the side tile with your green floor. It is just the side tile and back tile that don't match.
What is your plan for the shower door? What kinds of glass, hinges, how high will it go, door handle.
In these pics, the side tiles are all in shadows. Will light change the perception of both of the shower tile colors?
Plug in lamps on extension cords with various temps of light and play around during the daytime and night, standing on a chair to hold it up to the ceiling, and see how light may change the way this tile works. Are you planning on installing a light fixture in the shower? If lighting makes a difference, then add a light in there. That plus the shower doors may be the fix.
Q