Mix water with Elmer's glue and brush the inside of the mason jars. Add glitter of your choice to the inside of the jars, and roll/spin the jar around until the glitter coats the sides. Let dry and add a tea light!
If you are looking for a faster and less expensive way to create "snowballs", try these epson salt dipped ones! Super pretty! Source and tutorial (link is no longer valid) ....basically glue and roll in epson salts!