Originally Posted by PaperPrincess

To me it looks like the one block is just pieced with striped fabric. Four quarter square triangles, matching the printed stripe in the fabric. The reason why some blocks look like there's a red border on that block is because some of the blocks were cut so that the gold stripe forms the square in the middle, and some were cut with the blue forming the center square. It's just how the print of the fabric wound up in the block.