Hi Danielle,
My son is 13 months old, and he throws his food sometimes, too. I only put a few tablespoons of food in front of him at anytime, so if he decides he's going throw food, it's not going to be a huge mess for me.
When he does throw food--or otherwise starts playing with it--he gets one, and only one, verbal warning that if he doesn't stop, his food is going to be taken away. If he continues to play with it, meal/snack time is over for him.
He learned really fast that we mean business. The one warning now almost always does the trick. Also, I have learned that when my son starts to play with his food, he really is getting full, but he may be snacking on food that's in front of him just because it's there.