When I was buying flowers for my bouquets, I bought extra hydrangea stems (fortunately they were on clearance) and made pew bows for decorations at the wedding ceremony.
The stem was taped onto a pew clip (which can be purchased from orientaltrading.com) and then I added 6" organza ribbon to make the bow and hanging ribbon. I also added some 1.5" satin ribbon for more interest.
After the wedding I was able to recoup a lot of the costs by selling all of the pew bows to a Craigslister who just happened to be planning her own wedding with the same color scheme. You can't do that with real flowers!
For a variation you could make pew bows without the flowers on top and you could add colorful ribbons instead.