I bought some free range brown eggs and my mom but them in the egg cooker first, never thinking they wouldn't take color. The color didn't really show up but made them shimmery - just like a golden egg from Charlie & the Chocolate Factory, only smaller!
The white eggs held the color really well - the technique here is to put on a plastic glove, put a few drops of color on the egg and then roll them around in your hand until the color is distributed through the egg to your liking, adding more drops or another color for a more intense result.
For the next few days, I will have my fill of hard boiled eggs!
These 6 are my favorites because I mixed the colors together.
Here you will see I tried to make a polka dot egg by putting round stickers on the egg, dying it and then removing the stickers. It worked ok but I had trouble removing the stickers. Above the polka dotted egg is a brown egg with blue dye on it and to the right a brown egg with purple dye.