Use a tie that you won't be wearing anymore. The tie should be 100% silk. A tie made of any other material won't work. Choose a tie that has an interesting pattern. Dark purple, blue, and red ties work the best. It doesn't necessarily have to be a beautiful tie. "Uglier" ties sometimes make the most beautiful eggs. If you don't have any ties laying around, silk ties can be found cheap at most thrift shops. Be creative and give free rein to your imagination as you make more eggs.

Summary:
Find a silk tie. That's it!