I keep a tote full of little triangles from years of making HSTs by snowballing the corners. (I only cut out the MIDDLE LAYER because this allows the original correct shape rectangle to remain for matching to the next block segment.)
Every once in a while I'll sit down and match and piece HSTs and Quarter Square Triangles from those saved triangles. And then I use them as cornerstones in sashings; on the corners of borders; as the hearth block in log cabin quilts; in the middle of eight-pointed stars; double-sided as tree ornaments; mug rugs; fill-ins around odd sized blocks; oh, just hundreds of ways!
Jan in VA