I wonder if it could have been grammatjr's cutwork portraits, also called stained glass portraits? Here's the first -
http://www.quiltingboard.com/picture...s-t130238.html
I don't think she wrote a tute, but she did share information in some of her other posts, and she was planning a book on the subject.
Edited: Apparently there was originally a tute that could be downloaded, but it has been removed.