I finally completed my Soiree quilt - it was very difficult to get hold of enough white homespun to finish the top, and then I discovered that since I had enlarged the top the backing was no longer large enough. A day of fussing and measuring and sewing later, and it was all done.
The backing is a lovely soft coral minky fleece. I didn't use anything in the middle, so there are just the top and bottom layers. It will be just right for a summer weight quilt.
It has also been used as a lounge quilt, but the combination of two children and two cats with all that white makes me think that it will be staying on our bed from now on.