I was asked to do the same thing at church years ago and it went very well. I printed off patterns that they could get experience in several methods of piecing and they all did a few blocks that were the same. One to applique, one with curves We did a sampler and I had the yardage requirements from it. It was fun and I'm not comfortable in front of people either. Some people did the squares and made them into pillows. It was a quilt as you go sampler.