This post is really late, or really early depending how you look at it. But this idea was too cute not to show off! Unfortunately I am not as creative as I think I am, so I copied the idea from here. Think mine looks pretty good though...if I do say so myself.
I used a reasonably priced cylinder glass vase, 48 #2 pencils (thought that was plenty but I could have used a few more), and a couple bouquets of sunflowers and held them in place with three rubber bands. And wahla, a beautiful gift for a special teacher!