For a beautiful marble effect on hard-boiled eggs at Easter time, wrap the uncooked egg in onion skins before boiling them. These eggs will not stain clothes or hands and they are perfect for an egg hunt because the dew from the grass will not change the colors and because they blend so well with rocks and leaves. The yellow and red onions produce a stronger color than the white skins and some will be so beautiful that they are the only centerpiece you will need and you will wish you can keep it forever.
I made these growing up with my grandma and this is just how she made hers. I didn't have any cloth, so I made mine by wrapping the eggs in the skins and then wrapping them in aluminum foil. I wasn't sure they would turn out, but they did! So much easier and less time consuming. The eggs are beautiful and I am happy to find a new spin on an old tradition. I did add a teaspoon of vinegar to the pot; not sure whether that did anything or not. Also, once the eggs are cool and dry, you can make them shine by rubbing a tiny bit of vegetable oil on the outside. - 23 Mar 2010 (Review from Allrecipes US | Canada)
In Greece they used to make Easter eggs this way before there was dye! They use only red onion skins to produce a gorgeous, deep hue. Try it!!!!!!! - 08 Jan 2009 (Review from Allrecipes US | Canada)
Another way to do this is to put one color of onion skin loose in the pot with the eggs, instead of wrapping them. This creates even coloring across the entire egg, if you don't like the mottled appearance created by wrapping the eggs. - 30 Jan 2010 (Review from Allrecipes US | Canada)