Mix food dye with 1 cup of shaving cream to make swirls etc. Roll egg into shaving cream and let sit for about an hour. Wash under room temperature water. Egg with have a varying degree of color shading with swirls. I would not recommend eating these eggs because of the chemicals from the shaving cream.
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I have also received information that you can do the same with cool whip but have not tried it. It seems like it should work and would allow the hard boiled eggs to be eaten also.