This egg was made by covering an entire egg (don’t forget to poke the hole in the bottom to let the hot air out during curing) with a very thin layer of translucent polymer clay and cured the egg. The purpose of this was to give the egg shell some stability so that when i pressed the stamp onto the next layer of polymer clay (a pretty thick layer of translucent polymer clay) it would not crush the egg shell. 
I did this second layer near my stove-top and oven to keep the clay pretty warm (so it was/is winter, and the house is barely 62 degrees, not conducive to conditioning clay) so that when i used a stamp (one found in a collection of rubber stamps) to impress the floral pattern on all sides it would make a deep impression. It was important NOT to cure the egg a second time before totally finishing the stamping and impressing the lines which might have become blurred (this has to be pretty obvious). I actually rolled it smooth a couple of times before i figured out how to handle the egg so as not to flatten out the embossing on the opposite side. Egg was cured, cooled, sanded just a little bit, and a gloss medium mixed with various colors of acrylic paint just dobbed on the surface to highlight the impressions. It was a fun technique to try, I think maybe at some point i will try it again.
It looks a little like steam-punk. Ha ha, if i had used a metallic paint and black and grey it might have looked like metal. That would be kind of fun, and one could use nuts and bolts and screws and washers and lock washers and gears and hex wrenches and screwdrivers etc etc to make the impression of common metal objects