check out the tutorial "Ditter's String Quilt" -- great tute plus she has another one that shows how to qayg. Both excellently done. There are other examples if you search on "string quilt".
The blocks only appear to be on point when actually it's the (in Ditter's example) dark diagonal center strip on each block that makes the 'on point' illusion. They're really comprised of squares with each square's dark strip meeting the dark strips of the adjoining squares. It'll become clear when you check it out.