You can, for example, throw a bunch of pins, buttons or paper in the bouquet’s construction. And probably any other materials.
You can integrate various fruits and feathers in your bouquet. Also, if you want something more original, you can tweak the design. We are bold enough to invent an incredible design.

In short, we can make any bouquet from flowers, any material and any stylistic changes. Generally it is best to make sure that your bouquet fits your outfit (it is best to check with a designer), but there’s no rule in the rest of floral arrangements. If you are after a  high symmetry, you can match all your wedding  floral composition, but that is not in any way any obligation.