Here's a nice set of floral studies from my Notable Impressions line of fineart photographic prints. A group of four makes a good group - and as you can see, they don't have to be all the same kind of flower to work well. Here we have a Solomon's Seal, Annabelle Hydrangea, single-flowering Peony and an Oriental Lily.
Another client recently selected this very dramatic group of three:
And here's another - Hydrangea quercifolia, framed in a nice simple oak frame: