Try one of these techniques:
Iridescent finish: Put approximately 1/2 tsp. of Pearl Ex into ornament. Narrow craft sticks work nicely to get the Pearl Ex inside of the ornament. Hold fingertip or paper towel over opening. Turn and tap ball to coat inside. Pour out excess. Repeat with glue or adhesive and other colors if you like.
Speckled Faux finish: Load a dry artist's brush with Pearl Ex. Place in ball, being careful not to touch sides and flick. Repeat with several colors.
Antique Keepsakes: This technique works best on the larger ornaments and/or with smaller pictures. With artist's paint brush, white glue the fronts of magazine or Xerox pictures. Using tweezers, place these in the ornament. With a pencil eraser, firmly attach while removing creases and air bubbles, especially around the edges of the picture. Brush a coat of white glue to back of pictures. Let dry until glue is completely clear. Coat the inside of an ornament with one of the above finishes. As an alternative, try glueing the picture to the outside of the ornament.