What a project! If you saw my scrap management video you would see I kept all triangles from snowballing project. I have topped this up with all the bits left after squaring up my string blocks. And from all that I have created wall art piece, cushion covers and table runners. And I already have an idea to make quilt blocks out of it using left overs of battings! I tried couple of methods of getting the bits to stay still while sewing and found what works for me.
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Reference videos:
Wavy border and binding:
Scraps management:
Patching batting: