Buy a box of blond hair dye (avoid ash shades though), then go to a beauty supply store and look for either Color Ion or Manic Panic in the shade you like the best…..I do not recommend buying a box of blue dye from the grocery store or pharmacy because they bleed blue fucking everywhere like you wouldn’t believe, anything that touches your hair will be blue and it’s a pain in the ass. Color Ion and manic panic will also rub off onto pillows over time, but it’s nowhere near as bad as box blue shit. Also, do not try Beyond The Zone for any shades of blue because they won’t work….it’s unfortunate because they make great shades of pink that are fairly long lasting but their shades of blue give the same results as using kool-aid packets in your hair, it’s a dingy very light blue that will look more like you spent too much time in chlorine.