Try Electric Blue and Fish Bowl Blue from Special Effects to achieve this look.
Cobalt Blue Streak in Blonde Hair-Lovely Dalliances
Cute blue berry hair streaks
Long braided dark blue hairstyle - http://ninjacosmico.com/28-crazy-hairstyles-ideas/
Love how they mesh
Purple Peek-a-boo... Would love to do this with my hair. Too bad work won't let me.
Curly Blonde Hair With Purple Peek A Boo Highlights Pictures, Photos ...
6. This plain polish looks so trendy with a matte topcoat!
Platinum, purple and blue