I think that Posies Round the Square was my hardest block so far. You wouldn't think it to look at it, but curves are not my favorite thing to do, and this applique was tiny. And it has been too long since I did any applique too. I traced around the patterns Jennifer provided, and added the applique as back-basting. I machine pieced the basic block and hand appliqued the posies.
I finished the other two blocks late last week, but didn't post them then. These were both paper pieced, so not too bad.