I found several on Pinterest:
http://www.pinterest.com/search/pins/?q=silk%20quilts
Alex Anderson made this gorgeous silk quilt:
http://www.flickr.com/photos/harrispen/7579725734/
I'd love to make a silk quilt someday. I saw a gorgeous antique quilt (I believe it lives in Bill Volckening's collection) that I think would be fun to interpret in silk. It was made of diamonds that were maybe 1.5" long from tip to tip. The seams were embroidered in a crazy-quilt style. Several diamonds were made up into larger diamonds that were bordered in black fabric. The result was a simple but stunning quilt.