Eggs are decorated for many centuries. Very expensive eggs were made by Peter Carl Fabergé and his company between 1885 and 1917. The most famous are the ones he made for the Russian Tsars Alexander III and Nicolas II as Easter gifts for their wives and mothers. More info you can find here Wikipedia Faberge egg
That is why the theme of March is eggs! Of course you can decorate your egg with jewels and diamonds but feel free to create your own style! You can draw, paint, sculpture, knit or whatever you like as long as it is an egg! You can send in your artwork untill the 23th of March. Have fun!