They are silk-dyed with scraps of thrift store silk! You can buy a kit from this lovely shop on etsy: http://www.thejunebride.etsy.com/ Or you can find your own scraps, as the wonderful shop keeper notes, she even generously provided these Martha Stewart directions that inspired the etsy listing: http://www.marthastewart.com/article/silk-tie-easter-eggs
Me and Willie had a great time last year, dying eggs with vegetable dyes we made ourselves, so I think this year we'll try this out. Its gonna be much less messy. Since we have some fantastic thrift stores in our area, I'm planning to find our own silk. It's a gamble though, b/c if I don't these etsy kits may have sold out. She has them up for a fabulous price of $10.50 and free shipping in the U.S. so I'm torn. But I love a good thrift store trip, so I'm going for it.
I think I'm totally into Easter as a grown up person.