I don't know the name of the pattern, but I can tell you how the first one is done. All you do is cut squares twice: once horizontally, and once vertically, on varying slants without measuring anything. Then add strips your chosen width and reassemble into a square. They are probably all squared up again before sewing together.
The quilt in the fourth pic is done the same way, but with only one cut into the square, and using pieced strips added inbetween the two halves of the square. The added pieced strips would turn the squares into rectangles, and in the pic they are all squares again, so they must be cut down into squares again before sewing them all together.