Never use pigeons to fly out of wedding bells. Pigeons are innately self-centered and disrespectful and do not symbolize the marriage union.

Never use butterflies either. Whenever they are cooped up they are literally in hell, they become unhappy, and they die.

I suggest using 12 sparrows. They don't mind being temporarily caged, they know how to fly to freedom once released, and they represent the cheerfulness of Nature in any country in the world.

I've also seen too many opaque wedding bells--they should be mesh-like or lattice-like, to allow its short-time inhabitants to breathe and see light.