One colour I haven't mentioned and that's yellow. Yellow was used as a safety net by Penguin for anything that didn't fit any of the regular perameters. Life's Too Short by Jenny Medd, for example. An oft repeated mantra here at at Medd Towers, along with 'there are no pockets in shrouds' and 'you're a long time dead', 'life's too short' is a stock response when defending your corner.
Anyway, here's that nice man I was telling you about.