Butterflies make a great wedding theme and they are so popular at the moment which means you'll be spoilt for choice on how to incorporate them into your wedding.
Butterflies can be used in the design of your invitations, table planner, place setting and in your wedding flowers. After all there is nothing more natural that a butterfly hovering over flowers.
I think the reason they are so popular is because of their delicate structure and the best ones to choice are the ones made out of feathers as seen in the photo here. These are much better than the plastic variety as it enables them to keep that delicate fragile look.
For more ideas on how to incorporate butterflies into your wedding flowers visit http://www.wedding-flowers-guide.com/butterfly-themed-wedding.html and see how other brides have used them.