Here is a sample of a canning jar quilt (not done by me); I found it on line:
[img]
http://t0.gstatic.com/images?q=tbn:ANd9GcS-mQdgRom5zXuO1lfMwI99MQ20eMez9BHZgWdWJhrgB_z7wjLqRA [/img]
If you Google (images) you can find several more.
They are made the same as Bug Jar Quilts. Here is a free pattern:
http://quilting.about.com/od/blockof..._jar_quilt.htm