Well, My first thought about bouquets coming indoors was that it was likely during Neanderthal times just the way it is today when your two year-old sees dandelions for the first time, a whole field of them, picks them with great concentration and glee and brings the limp dangling handful to Mom as the golden gift of the Spring season, who then, finds a way to put them in water--perhaps a turtle shell or an empty ram's horn serving as a vessel. Behold-- the beginnings of floriculture.