For years I religiously had my hair hi-lighted blonde (I was naturally a dark blonde). I'm now almost 40 and my natural colour is darker (light brown) and I've stopped having hi-lights and moved to balayage. My hair had got very weak and dry at the ends so this was needed (as was a good cut!). But I just don't feel "me" with darker hair ... would I be able to go blonder again without ruining my hair (ie can non-bleach hi-lights be as good)?