Get the book Quilts! Quilts!! Quilts!!! It can be found on Amazon used for basically the cost of shipping so you can find multiple copies to distribute through the group. Some of your members may already have it.
http://www.amazon.com/Quilts-Complet...+quilts+quilts
In the back of the book is a lesson plan for making a lovely sampler quilt using patterns in the book. I think it spans 11 or 12 weeks?? Edited to add, the classes are geared to piecing not the actual quilting. You would be on your own for that but you can easily work up something on your own to teach hand or machine quilting on the finished top.
Not only will your ladies get exposure to loads of different patchwork techniques, they will end up with a lovely lap size/baby size sampler quilt. Your experienced members may end up exposed to a new trick or two and your beginners will gain the confidence and skills to tackle any quilt in the future.