No matter what season you are getting married in, brain storm about what fruit and vegetables are in season. Maybe your floral designer can incorporate those materials into your designs?

In September, I love working with grapes, since they are in season. You can buy flats from Costco at a great price (plus they are a consistent quality/shape/size when they come from the same source). Think "tablescape" of black grapes, cherry red roses and lime green orchids - super fantastic combination.

If the seasonal material is a good price, then you can fill the bottoms of vases with it, en masse, and accent the upper portions with fresh flowers.