I'm now adding fronds of leather leaf fern, a common greenery available all year round.
I like wiring individual leaves, since it gives me more control over where each leaf is placed.
This way you can bend the wire stem so that the leaf peeks out at just the right place in the corsage.
I lay the wired leather leaf against the back and make sure it shows from the front view.
If your corsage is just made up of one type of flower (like these daisy heads) a lot of interest can be added by simply using more than one type of greenery.
Notice how I build my corsage as you move down the stem. Each flower head is slowing changing from being faced upward to gradually facing straight on and then downwards.
The goal is to make the face of flower heads visible from different angles.