Wrap it with Twine. You can decorate mason jars in endless ways but these twine ones make stunning centerpieces. Here is the DIY mason jar twine, but feel free to adapt it to add lace, doilies, even chalkboard paper
Place cards and favors in mini pots of moss. Covered with a glass, each looks like a mini terrarium. Fill a 1 terra-cotta pot with moss, insert twig in center, and glue a name tag to twig. Cover with a glass, which can be used for drinks.