I finished Seven Sisters yesterday. It is block #3 of the Civil War block of the week by Barbara Brackman. This block was entirely hand pieced - my method of choice was reverse applique'.
The blue background fabric is one of my very favorite 1800's reproduction prints. It's from an older line called Vintage Indigo by Harriet Hargrave. I look forward to using more of Harriet's Indigo prints in future blocks of this sew-along.