Besides the Black and White challenge (scroll down to see) There were a number of other Challenges
( for complete details read here ). One of the Challenges was put forward by our local Modern Quilter's group. It was called "Improv With Solids". I'm not sure I got them all but here's a broad sampling. (Again, I apologize for the lack of labeling I just did not have enough time)
The above quilt was my contribution.