We decided to jump on the bandwagon and try to dye our eggs naturally this year. We used beat juice for pink, turmeric for yellow, red cabbage for blue, and paprika for red. The turmeric and beats turned out wonderful. The paprika really just turned the eggs brown. At first we thought the cabbage didn't work, but after sitting out of the water for about 30 mins they turned blue.
Anyway the way we did it was just to boil each of these herbs/veggies in about two cups of water with a splash if vinegar. Then we soaked the eggs in the pan for about 20 mins. It was definitely fun to do. I'm sure we'll try it again next year with a few more colors.