In space no one can hear you thang!

This is a replica of the egg from the film Alien. I printed it a few times, including with glow-in-the-dark filament and marble-like filament (which is what I recommend). Using a somewhat speckled filament will get you good results if you eat an off-white egg. Then you can add a green light inside. Or print it in different colors for your Easter egg hunt. It's your egg. Have a crack at it.

The hole in the bottom is designed to fit a single battery-operated bulb. I buy bags of them on Amazon. Look in my models for a replica light bulb. that you can use in your projects. It's the exact same size as the ones for sale online. Do an Amazon search for small LED bulb with batteries. You'll eventually see it. They look just like bullets but with a light on the tip.

Or build a display mount for it and run lights into it that way.

As far as support is concerned, you don't really need it, but if you add it get ready to pick it out of there. Your choice. You can also cut it in half lengthwise in Meshmixer and print the two halves before glueing them together.