For a one of a kind summer wedding bouquet, I suggest going with flowers that you don't see everyday. Let me introduce you to Monarda or Bee Balm. This particular variety is called Raspberry Wine.
Last year was my first year of growing this little beauty and I was very pleased. It has rich wine red tubular blooms with a fragrance that is intoxicating! The dark red pairs well with pink and burgundy as in this bouquet that also features hydrangea, gladiolus, and yarrow. The flowers have that wonderful cottage charm, and would look great for a garden or rustic style wedding. In the Raleigh, NC area the blooms will start up by late May and should persist through the end of June. A great source for this flower would be your local Farmer's Market OR Springwell Gardens of course!