Can the figures of rhetoric (read more) help you become a better writer? There are two tips from rhetoric that you might want to consider:
Alliteration: make your writing clean and crisp (read more) but don’t use alliteration within your clauses.
Parataxis: this is good, plain language which is direct and with a simple structure. It is “the natural way of speaking…”
Not a great list is it? (if you will forgive a rhetorical question). Forsyth ends his book, The Elements of Eloquence, by saying he hopes he has dispelled the imbecilic notion of the importance of being plain and clear or of writing for mere utility.
However, I think we need to learn to write crisp and clear contracts before we worry about adding colour!