ombre dip dye...yes pls

So as I started my job at Topshop head office this week, I am in major lust over EVERYTHING! I want every shoe they're buying, a whole new wardrobe and want to finally dip my hair which I've been hankering after all summer. I have sadly cut my long wavy hair to a v short bob so am having to something drastic....not sure which colour to go for though....