I think something like this would be fun. Just a few streaks of popping red or pink mixed in with the natural dark brown.
Photos - The Vampire Diaries - Season 4 - Promotional Episode Photos - Episode 4.17 - Because The Night - 130301vampire-diaries2large
Love that long hair & peek-a-boo red streaks!
Red Lowlights on Brown Hair
I like this! Maybe a little more tame for work instead of my full blown red?