Maybe there could be a random event that says, "Wow! Look at that! An egg. But as you go to pick it up, you realize that it's broken and theres nothing inside. Oh well." With a picture of a broken egg (it could be an Omni egg or something ;o) under it. This might make it a little more fun (or stressful xD) to find eggs, and might get people's hopes up at first. xD
Or maybe there could be a 5% chance that you'll break the egg when you pick it up? :o This would definitely make it harder to hunt for eggs, and might increase the value of seasonal eggs since they're rare, and once you do find it, it might break. :P
But I sorta doubt this is a really good idea. It probably would make work harder, but..... some people might think it's cool. >:D *cricket chirps* ;c