Don't do your entire head please . Go get it professionally done . Put a dash of color by your eyes in your bangs or some stands dangling the frame of your face . Use a hair reconstructor to condition your hair after you do this . 'It's a Ten ' is an excellent product to use . The color that you choose should be one that you like to wear in a t shirt . Black hair with white stripes is cool . If just white t shirts are what you like . But what I mean is , example. ..if you wear pink or green or blue . What do you like to wear most ?
matters on how spontaneous u like it and you first have to lighten your hair anyway so bleach it if you want to make it a more intense colour, personally I have pink hair but I know many people don't like hair that "out there" so you have to pick something that suits you while making sure u like it, hope this helps :)