Have you ever blown out the inside of an egg? It basically looks like snot and the kids LOVE it. I poked a hole in each end of the egg (using an unbent paper clip) and let the kids start the process. It takes a lot of air to get the white and yolk out, so there were a lot of red faces in my classroom :) Then, we dyed the eggs. They will last longer since they aren't raw or hard boiled, but hollow inside!