A German singer and songwriter, Knut Kiesewetter, has a whole song about skin colours and prejudices:

Sie sind grün (They are green)

Well, that's the title I recollect though on that site I'm linking to they have another title.

It's a song about green people who don't like the colour of their skin and paint themselves yellow, red, black, and white, respectively to realise in the end that they like the original green best and now are proud about that colour.

Wolfgang