Start with raw eggs. My favorite tool to pierce the shell is a small nail ~ for some reason, I've never had good luck piercing the shells with needles.
Pierce the narrow end of the shell with a tiny hole. At the wider end of the egg, use the nail to pierce a wider hole. This is the trickiest part of the operation, but I've been lucky and only lost a few eggs. Just handle the eggs gently, and once you make the hole in the wider end, use the tip of the nail to gently enlarge the hole.
Then, for those of you who have never done this before, simply place your lips over the smaller hole and blow. (No, you don't want to know what it looks like! LOL)...
... I am so sorry to do this to you, but this post has been moved to my new website, Book of Shadows, and can be found in its entirety here: Egg Charms