I have naturally brown hair and blue eyes, i wanted to go blonde before and it just didn't suit me bcs i have pale skin tone, people i know really love to see the contrast of dark hair and light eyes vs light hair light eyes (:
I have blue eyes and blonde (ish) hair and my eyes don't stand out very much unless I dye my hair bright red, then I look like I'm wearing some freaky contacts because of the contrast... I love it! Have you gone brunette before? It can be difficult to get a good, deep rich colour if you have light blonde hair, just bear that in mind because it can look pretty washed out if don't wrong, sort of gingery.