I don't think it would work, SouthernGirl, because 1) a vollyeball serve is too far back like Jamesaritchie pointed out, and 2) it would have to be launched pretty forcibly into the nose to make a serious dent like what you're talking about.
When I was in High School, I was picked on a lot by other students, and I believe some three times at one school I got hit in the face very hard by a basketball. I did not see it coming until someone said, "Hey Sean!" and I turned around just as the ball hit me in the nose. All it did was stun me and knock my glasses off. It never gave me a nose bleed or a black eye.
Now, I have also been hit in the face by a baseball, as it rolled along the ground and bounced up into my face when I tried to catch it. That did injur me slightly, as the ball was rolling rather slowly. Maybe you could use something like a baseball or something similar, as even a slow ball can hit like a missile, causing quite a bit of damage, especially if aimed at the face.