More to explore:
DIY Crystal Geode Eggs
Love science-y projects!
ice egg experiments
Science for Kids: Learn how to grow crystals overnight using Epsom salts.
diy geode amethyst style crystals grow your own crystals jewel box gold paint
Crystal Egg Geode - Martha Stewart
...not just for Easter
Egg science experiments
Walking on Egg Shells and 25 other cool science projects
GLOW eggs - made using homemade glowing dye. A NEW, fun, & creative way to decorate Easter eggs with kids (from Growing A Jeweled Rose)
Science Fair project for Brady