A while ago I wrote about a novel whose main theme was colour. I thoroughly recommend it and if you have the means you should pick one up.
However, it is a shame that the novel was published a few years ago because this year the Warwick prize for writing 2011 is to be based on a special theme: colour!! The short list includes a piece about camouflage and mimicry in nature. There is a £50,000 prize for the winner which will be announced later this year.