I have seen zigzag quilts cut and assembled a few different ways … Often they are squares made up of two right triangles, and the zigzag lines just appear based on which way you turn and alternate the square as you go. My pattern is based on an antique quilt that I came across [with] vertical columns of larger right triangles alternating their color and direction. Then all the columns are sewn in straight vertical seams. Either method gets you the same visual result, I just liked the idea of less cutting, and also less piecing, and thought you might too.
Down the pattern for this zigzag quilt at Anna Maria Horner’s website.