Put a piece of crayon in a clear Christmas bulb, use a blow dryer to melt the crayon while turning the bulb to distribute the color!!
There are the glitter ones, too. They take acrylic floor shine (such as Mop & Glo) and squirt that in the ornament and swish it around. Then drain it out and add super fine glitter and shake that around in it. Looks pretty amazing when they get done.