There are many ways to dye your easter eggs. You can use water colours, pens and what ever. One easy and simple way is to dye them like yarns or fabrics. Except you don't need to use toxics to fasten the colours. You can use what ever natural dyes. Here in the example I use onion peels. But blue berries, coffee, tea etc. will do just fine and is interesting.
Add the eggs into the pot.
Add the water. The peels will float. Boil the eggs as long as wanted. After cooking the eggs leave them into the water with the peels. Let the water cool down. Later on take the eggs away and let them dry in a stainer for example.
Onions give this kind of shade.