Brunette hair color makes the blue in the eyes stand out. The lighter you go, the more you dilute the appearance of your blues. But if you are bored, which I can relate to, I'd just do highlights. Why do the whole head? Do a couple of blonde chunks or golden color on sides or just one on top, one on side.
Browns that have gold in it, are from the red family and any colors with the word ash in it are in the green family.
I can't tell by your pic but I see a little reddish tones in there, so why not try auburn?