Coloring eggs is a fun project and a family tradition since I can remember. I have learned of some natural dyeing techniques over the years that work for eggs, as well as wool and basket fibers. Here are some color ideas:
Red- beets, paprika, red onion skins
Orange- any yellow ingredient plus beet juice
Yellow- yellow onion skins, tumeric (1/2 teaspoon per cup of water) celery leaves
Green- alfalfa, spinach, kale, violet blossom plus 1/4 teaspoon baking soda, tansy, nettle, chervil, sorrel, parsley, carrot tops, beet tops, or dip yellow egg in blue dye
Blue- blackberries, grape juice concentrate, red cabbage
Purple- violets, grapes
Pink- cranberry juice
Hard boil eggs with 1 teaspoon of vinegar in the water. Place dying ingredients in non aluminum pans, cover with water and boil 5 minutes to an hour or when desired intensity is reached, stirring and crushing the ingredients to disperse the color. Strain the coloring ingredients out of the water. While the dye is still hot, place the eggs in and let set in the dye until desired intensity is achieved. Some dyes act faster than others.
Or, just go to your local farmer and buy a mixed variety of farm fresh eggs like these.