Various animals can be made by using odds and ends found around the house, once you empty eggshells according to the instructions for Egg Blowout. Here are some ideas:
Color eggshell brown with dye or felt pen. Glue on a beak made of construction paper. Use two small stones for feet. Draw eyes with felt pen.
Dye eggshell blue. Glue on a beak made of construction paper, and wings and a tail made of tissue paper. Draw eyes with a felt pen.
Glue large pink ovals of construction paper on eggshell for ears. Add a pipe cleaner tail; draw whiskers and eyes with a felt pen.
Dye eggshell green, or color it green with paint or a felt pen. Draw scales with felt pen. Cut eyes, tail and fins from construction paper and glue on.
Dye eggshell pink. Glue on miniature marshmallows for 4 legs and a snout. Make a curly tail from a pipe cleaner. Draw eyes with a felt pen.