This is what I did.
Supplies:
Hair clips with openings in at least the top
Silk flowers (I got an assortment from doodlebug design inc. at the craft store)
Brads, a.k.a. paper fasteners
Instructions:
Make a hole in the middle of a silk flower. Stick the brad through the hole. Stick the brad through the opening in the hair clip and open the brad.
Note: I used regular paper fasteners that you find at an office supply store. Unfortunately I couldn't find shorter than 1-inch at the store, so that's what I went with. I figure I can use them for plenty of other projects. You can use fancier brads from the craft store if you wish.
Since my paper fasteners were so long, I wrapped each side around the top of the clip but under the flower.