A few things I am fond of...

I like to add some elements to a bouquet that are unexpected. Like citrus, as a special request from a client, whose family are citrus growers, and tree fruit to a centerpiece, because the family grows tree fruit.

I like to add unusual foliage, which I have grown in my yard, or the yards of fellow gardening friends to create different textures and patterns. I've even been known to ask strangers if I can cut a few pieces of this or that from their yard (much to the chagrin of my kids) to add to a special bouquet, to give it that look I want.