Spray eggs. Place hard-cooked egg on paper towel. Spray with pink, blue or violet Color Mist food color spray. Let dry, about 5 minutes. Turn egg over on paper towel. Spray other side with food color spray. Let dry, about 5 minutes.
Create metallic finish. Spray one side of egg with gold or silver food color spray.
Brush color to highlight. While egg is still wet, use brush to dab color around egg surface to create marbleized look. Let dry, about 5 minutes. Turn to spray and dab on other side of egg. Let dry, about 5 minutes.