Have you seen the new L'Oreal Feria Ombre hair color out there for home use? You start with dark hair, and comb in the highlights on the bottom. Ombre hair usually looks like bad roots to me, but this is pretty, with all the different colors.
Full balayage highlights over an ombré I did about a month ago. I love the piecey-ness at the top to transition into a solid blonde color at the tips of her hair. Styled her hair with messy waves to compliment my balayage.