It depends on how you want your hair highlighted. Big streacks, small ones, or ones that make it go with your hair. Personaly, I wouldn't mind the blue, if its a dark blue. A blue to me, wouldn't look that good.
Like for me. My hair is a natural blonde (yes people I"m a blonde. It answers everything). Now I want my hair lighted to make it brighter, so I"m getting brighter blonde highlights. So, its going to match my hair, like its my normal hair. Then, I'm going to put a orange yellow, and a red into my hair. There not going to be big streacks, but it going to look like its my hair colour. I'll post a picture once I get it done.