Every year I buy several boxes of different types of clear ornaments from Hobby Lobby. We paint them together as a family and its fairly simple even the youngest member can do it or at least help.
You need a clear glass ornament box, acrylic paint, and rubbing alcohol.
Rinse the inside of the ornaments with rubbing alcohol. Let dry for at least a day upside down. The opening facing down. I would let dry longer our paint didn't stick real well last year for some reason.
Then your going to take a few different colors of the paint and drip down different colors down the side making sure that they don't really mix unless you want them to. Cover the mouth of the ball with a paper towel. Shake REAL hard and swirl hard as well. Making the paint swirl around the inside of the globe.
Again let dry mouth facing down so the paint can drip out. Clean off the top and replace the cap and hook, once its dry. I may repeat steps if the paint runs again this year. How do you make homemade ornaments? Do you have any traditions?