what's the deal with all these eggs that are going to "hatch" the first of every month in peoples signatures? what happens when they hatch?

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I think they turn into a creature when they hatch...

http://arwen-undomiel.com/forum/viewtopic.php?p=222565

I can't find the link to the place where you get the eggs though

EDIT: Never mind, here it is: http://www.pickle-green.com/egraphics/main.php?id=eggs

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