And AFTER the eggs are eaten:

Eggshell Mosaic
A great way to use up the remains of the Easter eggs.

Materials:
Colored eggshells
construction paper
crayon, pen or marker
glue

On a piece of paper have child {or YOU}draw a simple design (e.g. flower, balloon, kite, egg). Spread glue in design area. Sprinkle bits of broken eggshells onto glue. Allow to dry then hang and enjoy.