I'm just kind of making this up as I go along. My initial inspiration was to use half-square triangles to form square-in-a-square type blocks. I also wanted to experiment with using a zig-zag border. Since I already had lots of HSTs, I just played with those until I had a zig-zag I liked. Of course, making it up as you go along sometimes creates design flaws...or are they planned design elements?
Can you see the flaw?
I have to make more HSTs for the bottom row. Once I've got that laid out I'll decide if I can live with the flaw...er, design element.