Fill 3 (or more) glasses with water and add the desired amount of blue food color to the water. Eg light, medium and dark.
Let the eggs soak in the solution and remove after they have reached the desired shade. Immediately roll them on two sheets of paper towels, from side to side, until they have dried.
Let them dry completely, then using a small paintbrush splatter them with gold paint and let them dry once more.
Notes
Store in the refrigerator or at room temperature, depending on your country’s recommendation.