Nobody wants "things" they are a waste of your money. If you decide to do favors (even though they aren't necessary) definitely stick to something edible. FH and I are having a cookie bar. Guests can grab a box and fill it up which whatever cookies they'd like.
We are doing a cookie bar. A family friend is helping us bake them all and the "personalized" part is the doggy bag that people can use to take one or two to go. I definitely agree edible is the way to in regards to favors!