This website gives a list (2009) of places to buy bulk flowers!
As a DIY crazy person such as myself, I have had a little experience in making bouquets and boutonnieres and centerpieces. It is something I want to do for my wedding. I will want some more experience before I launch right in and I will probably need the help of some sisters/friends, but with a limited number of brown and green flowers, this is the main reason why I chose cream as a third neutral color in my color scheme. Cream flowers are everywhere and I love cream more than a starch white.
(rose source has green roses)
(green calla lilies with brown spider daisies?)