I've always wanted to have red hair so I began to turn into a redhead as soon as I started to go grey. No pretence that it's real, but quite a few people have told me that they like it. My mother had dark auburn hair, my sister is a natural blonde and I have the fair skin.
I do like to look vaguely natural, but I can see the appeal of bright pink hair - though you might need a whole new wardrobe.
It would be a faff if you have dark hair as hair needs to be lightened so that the colour will show. I did it to my daughter's dark hair for a while when she had a broken leg and it was a long business. The colours also fade pretty quickly, though you can top it up with coloured conditioner. Depending on your hair it might also ruin it's condition. There was a product which did the lightening and colouring in one go, but meant for highlights rather than the whole head. Not sure if it is still available, it came from Superdrug.