I have dark brown hair that's greying in areas - no substantial chunks, but a peppering of greys throughout. I'm going to grey naturally and not dye them brown, but I wondered whether there was a way to have fun with them - is there a way that I can dye my hair so that the grey bits will go, say, pink or red but the rest will stay brown? Would one of those temporary Schwarzkopf dyes do it? For context I'm about to leave teaching after 20 years of good behaviour and I think I'm having a mid-life rebellion...! (Also it needs to be temporary as at heart I'm deeply conventional and it probably won't suit me...)