i dyed the ends of my sisters hair recently using a bright pink dye, i didnt have to bleach it first and the colour came out great, so there are dyes that you can buy that will change the colour quite drastically. however as the colour faded she was left with a salmon blonde colour (she is naturally mid to dark brown) so i guess there was bleach in it. you can buy these dyes in most shops now, i think we got ours from the local supermarket, but also try alternative shops. (the kind that sell baggy jeans)