Here are a couple of ideas worth considering.
1. TeliaSonera unified its operations across 18 markets using a symbol and a color (purple):
The purple colour differentiates us as we will be the only operator on the international telecoms scene using it. I personally like the colour very much as we can “own” it, and it is modern, warm and unique in many ways, says Cecilia Edström, Head of Group Communications, TeliaSonera.
2. Simon Sinek talks about the Why, the How and the What in this TED talk: