A QuiltPlan piecing reference
Quarter-Square Triangles
two half-square triangles, four ways to combine them
Layer two half-square-triangle units right sides together, seams nested. Stitch a scant ¼″ on both sides of the opposite diagonal, then cut apart on that line. One pair of HSTs always yields two quarter-square-triangle blocks.
Same pair, twice. Two identical HSTs give a clean two-color hourglass, no mirroring to track.
Shared feature fabric. Keep fabric A in both pairs and swap the second fabric: the cut yields two mirrored three-color blocks.
Add a background solid. Trade the second HST for a plain square: the feature fabric floats on a quiet field.
Full value block. Match the solid to the dark half: fabric A becomes a single accent triangle on a solid ground.
Swap in your own three fabrics. The pairing logic stays the same.
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