Made this as a prop for a fan film. It's made of quarter-inch foamie sheets that were cut into petal shapes and glued together, leaving the flaps at the top. Then it was dressed up with a couple cans of Great Stuff expanding foam insulation, some bathroom caulking, some hot glue drips, and some textured spray paints.
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I also rigged up some aquarium tubing down through the bottom and ran high-pound fishing line through it to each petal so I could stand off-camera, pull on the strings, and have the petals open like this:
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You can see the finished egg in action in my fan film "Aliens: The New Hive", here on YouTube:
Aliens: The New Hive - YouTube
The egg appears about 3/4ths of the way into the movie.

I also rigged up some aquarium tubing down through the bottom and ran high-pound fishing line through it to each petal so I could stand off-camera, pull on the strings, and have the petals open like this:

You can see the finished egg in action in my fan film "Aliens: The New Hive", here on YouTube:
Aliens: The New Hive - YouTube
The egg appears about 3/4ths of the way into the movie.