This one is not a how-to book. But as far as "idea books" go, this is the best one I've found. Conolly's arrangements cover a variety of period styles, with global roots from Russian to Greek to South Asian, as well as just classic contemporary looks. The book showcases his great use of unusual foliages, fruits, and other materials, and covers all seasons, color palettes and (most) climates well, unlike many books which only offer suggestions for pastel summer flowers. You could scale the ideas down (all the weddings in the books are lavish million-dollar affairs) and end up with some very usable concepts for a smaller wedding or party.