Flying Kite bkgnd fill p2p $12.00 USD
Pop four of these sets of lines into the background - put a border around the outside of the triangle segments of the block, use the fill (outside) function and the background will sew - continuously - exactly fitting your block!
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Other patterns of this type can be found by searching for
Blocks: Other Block Shapes, p2p, Pinwheel variationsThemes: Straight(ish) Lines, fill & background