Shortly after Felisfire opened, nine eggs were released (all 9 original eggs with their original art can be found in eggdoku) that were supposed to represent the nine feline breeds that felisfire would count in the future. These plans were later delayed, changed, etc., but in the early days all these eggs were real items that had a name.
A sky blue egg with white netting was called a "Milian" egg. The Milian breed was supposed to have a 6 day gestation period and be one of the rarer common breeds (somewhere in the middle of dominance). It never had any concept art or even concept ideas related to the name.
The egg art was later used as the Zerda egg, which was released in 2011. The breed name of Milian was dropped has not been used again.