I thought about it for my wedding last November. I looked into using Daffy Apple. I ended up not doing it but I think it's a cute idea.
I am planning my wedding for next fall and my main accent color is a deep red and thought the candy apples and/or caramel apples would be great!!! Go for it!! some may thing it is messy but most people take the favors home to have later instead of eating right then and there. I think this just helped me confirm my decision to do them!! YAY!!! lol