If you are looking for a 100% organic dyed eggs, you may try Marbled Tea Eggs.
Hard boiled white eggs
Liquid food colors
Rinse the hard boil eggs with cool water. Fill disposable cups about 1/2 to 2/3 full of water. Add 1 tsp of vinegar (for every 1 cup of water). Add drops of food color until you're happy with the hue.
(once you get the color you like for the water, add 2 more extra drops as the eggs, when dyed would be two shades lighter than the water color). Put hard boiled eggs in the cups. I left mine in there for half an hour - the longer in the water the deeper the color. Remove from the cup and let dry. Wipe with vegetable oil (with paper towel or a rag) to make a glossier egg. Store eggs in the refrigerator.