I alternated working on Sophie's Sewing Set with the fall quilt, as sewing on a long lace trim is a rather tedious job.
The edges of the center rectangle are very straight.
To "blend" them more with the surrounding blocks I added a curved lace trim.
For the corners of the rectangle I had to adapt the lace.
I cut a suitable piece of lace......
...and cut an even smaller piece....
...and sewed it on exactly (more or less) in the corner.
That way the curves of the lace continue through the corners of the rectangle.
The completed edge.