To make the eggs, fill your container with water.

Add a few drops of nail polish onto the water's surface (since it's oil based it will not mix with the water, but float on the surface of it). Next, add your second color of nail polish to the water.

Use a toothpick to swirl the colours of the nail polish together and create the marbled effect.

Dip the eggs in and then let them dry. If the whole surface isn't marbled after the first dip, once the eggs dry, you may dip the other side again.