Mason jars as drink glasses for the evening and they are a simple keep sake. Guests could fill at the end of the night with favors of choice ( candles, candy.etc ) I LOVE this idea! I'm sure it would be pretty cheap too!
The No-Bake, No-Cook, No-Time Gift Solution - 4 Snack Mix Recipes in a Jar. I am so making these for teacher and neighbor holiday gifts! Winco bulk bins would have a lot of these ingredients. These ideas could be used for the elf jar fillers