For some reason, people, and children especially, like to take care of things that grow and change. Plants are a wonderful way to do this, and Egg-Head's are super-duper fun!
DIY Network has a good tutorial on growing grass in an egg. This is such a fun idea, because you can decorate your egg in various ways, and each one will be different. It will also be fun for children to cut their egg's "hair", when it gets long. You can have short, spiky hair, or long, fine hair. It is up to you!
Taneil Linschied enjoys crafts of all kinds. You can find her blogging at Defective Compositions.