Wow. What a response!
To answer a few questions:
I did the blue eggs with a packet of easter egg dye I found at a deli. I think it's Russian so I can't read the name. The packet is pictured with the eggs.
To blow the eggs you make a small hole at each end using a pin. I make my holes a few millimetres,or 1/8" to 1/4", in diameter. Start the hole by sticking the pin straight through the shell several times in a little circle, enlarge and neaten the hole by carefully chipping away at the edges. Blow out the contents then suck a little clean water into the egg from a glass as if the egg is a straw. Shake it around and blow the water out. Repeat a couple of times to clean the inside of the egg.
You don'd need to dry them before removing the stocking. Just wait for them to cool or run cold water into the pot.
The eggs are still pretty strong. If you are carefull with them and store them in an egg carton between Easters then you can keep them forever without breaking. My mum has a huge collection of dyed and painted eggs. She displays some in a bowl, some in egg cups and some hanging.
To hang the eggs, tie a piece of ribbon or thread around a piece of toothpick and insert it into one of the holes. I used scissors to score the toothpick in the middle so that the ribbon didn't slip off.
One other tip: You don't need to buy onions. There are usually plenty of loose skins around the onions at the supermarket.