This lovely emu egg has been etched and only etched. The process is the same as Pysanky, but the colors come from the natural colors of the eggshell. I start with the dark green (and sometimes gray) egg and wax my outlines. They show up as the darkest color on this egg. Then I give the egg an acid bath (Acid Magic is a good one) and give it a gentle scrub with a soft toothbrush until I judge that the color has changed. I rinse off the acid, dip in a baking soda solution to stop the acid from working and wax in the slightly lighter areas. I repeat this process for as many times as I want layers, ending with the white innermost layer of the eggshell. This can be pretty scary because if I go too far, I etch a hole right through the eggshell.
The design itself is one I revisit because I find it interesting. I hope you do too!