It's Easter and you're looking for something fun and different to make. Or maybe you like surprising people in your life with showers of small pieces of paper scattered all over their heads and shoulders (and clothes, and shoes, and floor and etc etc etc). Either way, consider making some cascarones.

(Above) Some cascarones, filled with surprise and confetti
So what are these things? Emptied and dyed eggs, filled with confetti, sealed off with some tissue paper. Once their done up, their whole reason for being is to be cracked over some unsuspecting person's head. Hilarity ensues. And probably relief, since if the person thinks they're getting beaned by a raw (or even a cooked) egg I imagine one filled with relatively harmless confetti would be a step up.
They're not quick, but they are easy to make.
Step One - Empty out the eggs. I used a knife to start a hole at one end, making sure the hole is big enough to let the egg out whole. You can use the eggs whole or separated for recipes, of course since here all you care about are those empty shells.
(Above) Holding an egg with a too small hole
Step Two - Wash and Clean Out the Eggs. Once they're emptied, rinse the eggs out with water. You may also want to use your finger to fish in the eggs and remove the membrane clinging to the inside then give another quick rinse.
(Above) Egg all clean, index finger with the membrane
Step Three - Dye the eggs. Made up some green and blue egg dye (3/4 cup hot water, 1 tbsp white vinegar, and a bunch of food coloring), because I had brown eggs I left the eggs in for a long long time. Because the eggs are hollow they'll float so gently push them in the dye until they fill so that they'll get more completely covered. Leave in the dye until they're the color you want. carefully take them out (emptying the dye from inside them).
(Above) Dye-ing away
Step Four - Let Them Dry. I put the eggs on the ends of cocktail stirrers, put the stirrers in a short glass, and let the eggs dry overnight. The next morning they were looking cute and ready to go.
Step Five - Cut Up Some Confetti. Since I was working with green and blue eggs I made up some very small blue/green/white confetti.

(Above) Dried Dyed Eggs! And Confetti!
Step Six - Fill the Eggs with Confetti. I made up a a funnel out of waxed paper and filled the eggs. Was glad that the confetti was small, since it made it slide in easily! When each eggs was about 3/4 full I moved onto the next one.
(Above) All Filled Up!
Step Seven - Paste Tissue Paper Over the End(s). I cut out small squares of tissue paper (small enough to not overwhelm the egg, large enough to cover the hole), applied glue stick to the paper, and pasted it over the end of the egg. I used two layers of tissue paper pasted over each other, contrasting colors offset at 90-degrees.
(Above) Mid paste, one layer on one to go
Was going to leave it with only one end covered but my artistic accomplice recommended pasting the squares at both ends. Since I didn't take his earlier suggestion to use the eggs as clown noses I decided to give it a shot. Am glad I did, it balanced them out well.
Step Eight - Enjoy! Haven't broken any of these babies yet, almost don't want to. Planning on giving one or two to my god son, maybe taking one to the party I'm going to tonight, and hiding the rest for my own use. Because, really, if anyone's going to be surprised by ones of these being cracked over their head I don't want it to be me!
(Above) The cascarones, looking cute and complete!
Interested in trying your own hand at it?
Instructions: Followed the instructions from Prudent Baby (http://www.prudentbaby.com/2011/04/how-to-make-cascarones-confetti-eggs.html)
Warnings: For the love of puppies don't use brown eggs! Mine look pretty but way more subdued than I'd like.