Find a blue shirt that is the same color as your eyes and put on natural colored eye shadow. The blue shirt will make your blue eyes look more blue and with the natural color eye shadow nothing will take away from your eyes. I buy my husband blue shirts that match his eyes because I love seeing just how blue they get.
I have eyes that change color, most of the time they are green, I buy olive green shirts because then my eyes change to the most beautiful shade of green. If I wear gray they turn gray and with some blue shirts my eyes turn blue. My eyes also change with my moods, so does my brothers.
I hope this helped!