I'm not really referring to a book in comparison to the role play itself but the writing everyone is doing for it.  After all we all want to improve as writers in some degree otherwise why have our work be in advanced RPs where a lot is expected.  A book was more an example since for it to even be published a lot goes into it (Unless you're a hack Twilight fan fic writer who happened to redo their story just a little and somehow became a hit because housewives wanted classy wank material.)

Point is I don't see how using colors can really help someone's writing skills out long term.

(I'm tired and probably rambling...)