I found a pin for an unusual egg hunt on Pinterest:
http://pinterest.com/pin/216383957066394684/It's a glow-in-the-dark egg hunt! Like all of my favorite children's activities, the idea for this one is simple. You purchase some glow-in-the-dark bracelets (they're just like glow sticks, only thinner and more pliable). Then, you crack them to get them glowing and stick them in those cheap, plastic Easter eggs.
I read through the pin, and the woman who originally came up with the idea recommended using the large, plastic eggs. I'd saved our eggs from last year, and all but one were the standard sized. With help from Colleen and her brother, Gene, we were able to get the glow bracelets into the eggs, but the eggs wouldn't stay shut without the help of some tape. Once we got them sealed, the activity was a lot of fun.