Sometimes removing the competitive nature of a game is a good thing. With color specific eggs, the kids can have their fun and get their prizes but you do not have to worry about the younger kids feeling left out.
A lot of Easter parties are family affairs with a limited number of kids to participate in the egg hunt. This can present a real problem when the egg hunters are of a variety of ages. If you have three year old little Nicky who is preparing for his first Easter egg hunt and cousin Sarah who at nine is an egg hunt veteran both looking for the same eggs it will be tough for little Nicky to compete.
The Rules: To level the playing field assign a specific color of egg to each participant. All of the blue eggs are for little Nicky while the yellow eggs are only for cousin Sarah. This removes any confusion about which eggs are fair game for the older kids and guarantees that each egg hunter is going to get their fair share of loot. Not only can this encourage a spirit of cooperation with hunters helping each other out(Hey Nicky, there is a blue egg over here!), but it also allows you to cater the prizes to each participant. If you know that cousin Sarah loves jellybeans, you can make sure that a lot of jellybeans end up in the yellow eggs.
The obvious downside of this type of hunt is that things become difficult if you have more egg hunters than options of egg colors. If this happens you can assign a color to a group of players. For example if you have three kids ages eight to ten, assign the color yellow to all three of them. But, if you do this make sure that you have three times as many yellow eggs.