A bit of natural blue food dye makes these eggs resemble the night sky with a full moon yolk center. I use a craft punch on seaweed sheets to make a silhouette. Here I have used a witch stamp but other excellent alternatives for Halloween theme would be cats, bats, spiders, pumpkins, leaves, or even howling wolves for werewolves.
Trim a sliver off the bottoms of the cooked egg whites before you fill them to keep them from rolling.