I agree with the two ladies above me, bleaching is the only method to get bright, colorful results.
Whether bleaching is a definite death sentence for your hair though, it depends how you go about it. For example recently i tried making red highlights throughout my hair (and although i failed miserably) there was no damage to my hair. However, my hair was in excellent condition before i bleached, and this may be why i suffered no consequences
If you wanna go for it id recommend subtle highlights so that you dont have to put as much bleach in your hair. But if you feel your hair is not in top condition- dont do it!
cat...im a kitty cat...and i dance dance dance
Tresemme naturals, GFTN
Lustrasilk + honey
KCKT, GVP CB
Ouidad CC, TIGI Catwalk, KCCC, PaulMitchell Sculpting Foam