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I wrote a mystery quilt for my guild's newsletter many years ago, and it has floated upon the web ever since. Every few months I get a photograph from a person or group who has used the pattern.
This is my favorite photo--I used it for my computer wallpaper for a long time. It is a group in Norway.
Here is one place where the mystery is posted. (It was written before uploading of pictures was possible, so it took some work to visualize the steps.)
http://www.quilt.com/UserPublishing/SummerMystery1.html
Below is one I made (expanded) from the pattern.