Glad to see you've found so many great ideas & can get some more of those layer cakes. You might also think about adding some sashing between the blocks before you sew on some more. You could do a coordinating solid to add a nice detail. I'm used to cutting based on inches, so I'd cut 1.5" wide strips which includes a .25" seam allowance on each side. I did an apron pattern from Australia once & remember their seam allowances were all 1cm. So maybe a 5cm wide strip of fabric (3cm wide strip + 1cm seam allowance on either side) would work. I did something similar with an applique quilt (mine has a 3-piece striped sashing, but 1 strip will work nicely. Where I have the black squares with flower yo-yo's, you can put a matching or contrasting pieced square that is 1.5" x 1.5" [or whatever the width of your strips is]).
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Sashing is not necessary at all. Just a thought if you wanted to add something more to your project.
