To create the colorful rice, place a sheet tray over your work area to protect it from the food coloring. You can also don old duds and a pair of rubber gloves to prevent ruining your clothes and staining hands. Evenly distribute the rice between three bowls, and then add the red food coloring to one bowl and the blue to another. Use a spoon to mix and distribute the color.
Now, add five to 10 drops of the essential oil to each bowl, and stir to coat the rice. Bugs don't care for the smell of citronella, lemongrass, or lemon eucalyptus, which makes these scents a good choice. The essential oil will lightly scent the candleholders and create a nice smell for your festive table. And while the candle is burning, it gently warms the rice, releasing even more of the bug-repelling scent.