Just posted this in the DIY Bouquet thread, but thought it might be of some inspiration/help to the rest of you!
I used this tutorial for the basis of my bouquet: http://www.bridesofaustralia.com/Diy_Bridal_Bouquet.html
My flowers turned out great on the day - I was so pleased! They lasted all day too and didn't wilt at all. Everyone was stunned when I told them I'd done them myself that morning!
Basically I bought small cube candle holders from Cheap as Chips for $2 each. I had 5 of these per table, in this order: candle/flower/candle/flower/candle
I soaked florist oasis with water and cut to fit the cube vases. We put three roses per vase, at different heights, then filled in the spaces with ivy (free from our garden!). I did this with my sister-in-law the night before the wedding, and just kept the flowers cool in our cellar. They looked fab!
I made 7 boutonnieres, 3 flowergirl baskets, 18 floral centrepieces and my bouquet and I think all in I spent about $400 for everything (the roses, oasis, vases, ribbon, florist tape, and corsage pins). I bought the floral supplies and flowers from Floriculture and had them delivered two days before the wedding. They were really helpful. I kept the flowers in our cellar, which wasn't supercool (prob about 18-20 C). It was great fun and I was so happy with how it all turned out.
Here's some pics:
Flowergirl baskets (small baskets, wound ribbon around the handle, filled with soaked Oasis and put in three roses and ivy to cover the bald patches):
Will add the boutonniere in a sep. post