If you’re crafty or have any type of office supplies I use mine for paper clips, binder clips, tacks, sewing pins, buttons. You could use shorter/wider ones for storing jewelry since air tight containers are best from keeping pieces from tarnishing or getting a patina anyway (it’ll slow that from happening anyway). If you have cute or unique looking jars use them as bud vases for some flowers on bookshelves or a vanity. You could use them to collect things like sand/seashells/rocks from traveling and roadtrips. You could start a change jar to put all your change from things throughout the year in and add it up at the end of the year.