PLEASE HELP!!!!!!! What unnatural color?

I have dark brown hair, a little past my shoulders, pale skin, hazel eyes, and am very short. I want to get unnatural color streaks in my hair, but i don't know what color. I was thinking blue or red, but then I was thinking like purple or green. I also have bangs, so would it look stupid if I added a streak in my bangs? I don't want to do something stupid to make me look uglier than i am. How long until it fades? Will it fade into another color? Will it damage my had very bad? HELP!