http://www.youtube.com/watch?v=GQYZ-YA9o2g http://www.youtube.com/watch?v=GQYZ-YA9o2g
So far, I m guessing you divide the screen size up and set a constant for the bar height (say 12 horizontal bars for example) and you pick a random number between the constant and constant - 5 or whatever and refresh the screen. It s hard to tell looking at it, but it s something I d be interested in reproducing.