Fabric Cafe has some patterns for 3-fabric quilts.
http://www.fabriccafe.com/cgi-bin/co...&category=PQLT
The following links may be helpful.
http://martysfibermusings.blogspot.c...t-pattern.html
http://www.quiltsforkids.org/pattern...quilt-pattern/
http://blog.leniwiener.com/wp-conten...quilts-two.jpg
There is a book called "3-Fabic Quilts" but I can't remember the author.
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Edited to say that I think the book is by leni wiener....see the last link I posted.