You could do something like this with the teal borders. This wall hanging finished at about 16" square. The curved blocks are basically drunkard path blocks, or you could use the blocks where you fold fabric squares on the diagonal, place them on top of a full square, and turn back the biased edge into a curve (I don't know what the technique actually is, but Jenny uses the technique in her new Cathedral Window tutorial).
This is not my original idea. There is a book out (this WH was done about 5 years ago).
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