The arrangement of blocks shown today is called 'Streak of Lightning'. It is very versatile. it can run top to bottom, as shown in the first picture, or left to right as shown in the second picture. Likewise the length of the 'jags' of the lightning can be changed to any length that suits the size of your quilt.
The second picture is a quilt that I made for my brother-in-law. The blocks are made from 7 1/2" squares of fabric sewn into 1/2 square triangle blocks. I have elongated the jags of the lightning to a more unusual setting. This quilt has been appropriately named 'Christmas Lightning'.