Appropriate age groups for this Easter celebration or activity:
Preschool and Younger
Elementary School
Middle School
High School & Beyond

Description of Easter celebration or activity:
Discuss the colors of the Easter eggs in your basket, and how they are symbolic of the Easter story.

Setting up and preparing for this celebration or activity:
You can use real, hard-cooked eggs and color 'em...or plastic eggs will do.

This was a poem I came across:

GREEN is for the palms that they waved at Jesus as He entered into Jerusalem.

PURPLE is for the wine He poured and blessed before He faced His final test.

RED is for the precious blood He shed from the crown of thorns placed on his head.

BLACK is for the sky as he died on the cross, suffering to redeem us.

PINK, YELLOW, ORANGE are for the dawn that morning when the tomb was empty, and hope was reborn.

WHITE is for the dazzling light that awed all those who saw Him arisen, the Son of God.

ALLELUIA!

Other suggestions or comments:
I know not everyone wants to study their Easter eggs this closely, and that the egg-dying tradition pre-dates Christianity. But for families who do view Easter in this spirit, it's a Way Cool thing to do.

Black Eggs...I've never seen black in the coloring kits, and I'm guessing that deepest Purple is a close substitution. ;-)