A wildly popular reuse is to turn jars into a chandelier, like this one from Marty’s Musings.
Here’s a more rustic tea light version of a chandelier with old canning jars from Homeroad. I would love to have this hanging above my farmhouse table!
I love these pretty outdoor lights that looks like fireflies in a jar, from All Things Heart and Home.
Simply Country Life turned a cabinet door into a holder for a pretty canning jar vase.