You can use two different methods to make these natural Easter eggs; a cold method and a hot method.
For the majority of these eggs I used the cold method. Just mix the ingredients in a non-staining bowl (ie: glass is great) and add hard boiled eggs. Let them sit until the desired color is achieved.
For the hot method I added the ingredients and raw eggs to a non-aluminum pan, brought the mixture to a boil, reduced the heat and let simmer for 15 minutes. Remove from heat and let sit until eggs achieve the desired color.

source : Wabi Sabi Style