Hope these help you on your search....
The following website has 3 free ones plus has some class mysteries you can purchase:
http://www.debbiescreativemoments.com/free-patterns.php
This site has some and some that can be purchased. The first one on this main page appears to be free for individual but she does state if using for a group or guild to contact her for consent first.
http://www.quiltaholics.com/mystery.htm
Here is another free one:
http://www.equilters.com/library/mys...ry4-begin.html