How to decorate plain glass Christmas balls??

You can stuff things inside, or even drizzle different colored paints and let them swirl around.

Rhinestones,glitter paint

you can use spray paints on them, inside the glass or outside. I have also put things inside, like sequins and a few rhinestones that reflect light. Or paint some mod Podge on the outside and dip in flakes of faux snow or glitter

Let the young ones loose with paint, glue and glitter for a few. You could make a santa out of some, paint scenes on some, pattern with paint and glitter, there are a thousand different things you can do.

Fill them with bath salts and give as gifts with an instruction tag.....fill with sand and seashells......fill with shredded paper to hang on tree (use whatever colors you like).......glue buttons, beads or sequins on the outside of the balls to dress them up.......dip them in marbleized paint to give them some color.........fill with potpourri...............lots of fun ideas.

tear up colored tissue paper and deco podge it on.