So, one of my aunts has been fantastic with working with me on the details for the wedding. She suggested (and keeps suggesting), however, that we do glass coasters as favors. I looked them up on the website and they are very cost effective and pretty. However, FI says (and I have to semi-agree with him) that food is likely a better option because what's the likelihood of someone using glass coasters vs. someone wolfing down a thing of Snickers and Almond Joys?
I do agree that the coasters have a very elegant feel to them... they are pretty, which is the type of feel we are aiming for for the wedding writ large .. but I also think you can't go wrong with food.