I took a class by Jane Ellen Balzuweit in September of 2001. Her contact information here.
(Front of Bookmark. As always, click on the photograph to view detail.) The person I was with received permission to teach this to our local EGA chapter.
It is my understanding this technique usually is done in white & off white fibers.
(Back of Bookmark.) I made some examples, for the class, using other colors so the students could have a better idea of working the fibers. I sent those samples to Cathy for the Bookmarks for Literacy outreach program her chapter is doing. 
This photo shows bookmarks made with dmc Perle Cotton AND Rainbow Gallery Overture + Encore! color #128.
Cathy was interested in this technique. I found some pictures, instructions, diagrams & definitions on line. Check out these links:
Diagrams, instructions, samples
Diagrams, instructions, pictures, samples
Wikipedia Info
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