Follow these steps to make your marbleized Easter eggs:
Pour half a cup of warm water in a plastic cup that can be thrown away later. You will need one plastic cup for each color you plan on using with your eggs. I suggest at least six-one each for the colors yellow, green, red, blue, purple, and orange.
Drip 15 drops of food coloring into each cup and stir until combined.
Set one egg in each cup so that it is completely submerged. Wait at least one minute before removing the eggs. Keep in mind that the longer you wait, the darker the egg will become. If you like your eggs dark, let them sit longer.
Remove the eggs and set them in an empty egg carton until they dry. If you don’t have one then you can use a paper towel or even a few sheets of newspaper.
Add 1 tablespoon of oil to each cup. Stir just before you place the egg in the cup. Quickly coat the egg without letting it rest in the homemade dye. You do not have to use the same color dye as you did the first time. For example, you may have dyed the egg yellow in the beginning. Now you can dip the egg in the blue dye with oil to create a blue swirl pattern over the yellow background.
Set your eggs aside to dry one final time. As the eggs begin to dry, you will be able to see the marbleized pattern appear.