I bent a wire in half and pushed both ends through my coil (this will keep the wire from cutting through the foam).
On the back side of my foam I used a button method to keep the wire from cutting through the foam. After pulling the wire through the button I twisted the two ends into a circle to use to hang my foam from a Command hook.
Here is how my two pieces of styrofoam look hanging on each side of my front door.
Now it is time for the fun! I just started adding my fall leaves and flowers sticking them into my foam. I kept the flowers and leaves coming out of the front of my foam.
To keep my decorations narrow alongside my front door, I simply used low temperature hot glue and a package of Dollar Tree fall leaves to hide the edges of the styrofoam.