I think I would paint the walls and cabinets bright, glossy white and add light green glass knobs. Then I'd focus on the green and add touches like towels, interesting glass vases, cups, bottles etc.You could but a cool piece of wall paper or art in the nook above the sink. It has a kind of 1960's hawaii vibe that I love. I think if you brightened everything else and focused on the pretty green it would make a big diff. Got room for a potted palm? Also, I'd uber clean and bleach the grout.