Start by cutting a bunch of little circles out of fabric. I would say at least 10 for one pom pom corsage.
One easy way to cut out circles is to fold a square piece of fabric in fourths and then making a round cut from corner to corner. After you have the circles, you can fold them back into fourths and stitch the pointy corners together.
Fold the circles in fourths like this. Then you need to add more and more folded circles until your poof is fluffy enough.
Stitch the folded circles together in the middle. Once you let go of the little circles, they will fluff up like petals. Add more and more folded circles until you get a pom pom flower that looks full.
I used this furry fabric for the backing of the corsage, but you can use anything thick like felt. I stitched broach pins to the fabric, but safety pins would also work. I sewed the pin to the backing and then used a hot glue gun to attach the flower to the backing with the pin. Here is mine:
(Cool tip-- if you use a pin as your backing, you can always slip a bobby pin into the pin and pin the corsage into your hair for a hair accessory.)
And there you go! Fluff the flower to taste and then pin it on your favorite cardigan or blazer. Hope this helps all the other accessory addicts out there. ;)