Grab a large baking sheet. Spray shaving cream over the entire baking sheet.
Use food coloring dyes and make drops all over the shaving cream.
Using a spoon, straw, popsicle stick, etc. make swirl patterns into the shaving cream. The designs will bring the drops of food coloring together and that will end up on the egg, so keep that in mind. Swirl as much or as little as you want!
Carefully set your completely dried hard-boiled egg into the shaving cream mixture. Roll into the shaving cream mixture to coat all sides.
Using a paper towel, carefully wipe the Shaving Cream Egg clean and set aside. Repeat until all eggs have been coated!
Notes
TIP: The longer you let the egg sit in the shaving cream with the food coloring, the brighter the colors become!