new_contents: from PIL import Image, ImageDraw
  
  import random
  
  W = 500
  im = Image.new('RGB', (W, W))
  NCOLORS = 19
  NLINES = 15
  
  def make_line_mask(im):
    mask = Image.new('L', im.size, color=0)
  
    grays = []
    v = 255.0
    for i in range(NCOLORS):
      grays.append(int(v))
      v *= 0.91
    grays.reverse()
  
    draw=ImageDraw.Draw(mask)
    y = im.size[1]/2
    for i in range(NCOLORS):
      draw.line((0,y, im.size[0], y), fill=grays[i], width=NCOLORS-i)
    
    mask.save('mask.png')
    return mask
  
  
  def make_master_line():
    '''Make an image with alpha to be pasted for all lines'''
    im = Image.new('RGB', (W, W), color=(0, 255, 0))
    mask = make_line_mask(im)
    im.putalpha(mask)
    im.save('mline.png')
    return im
  
  def add_line(im0, im1):
    x = random.randint(-W/2, W/2)
    y = random.randint(-W/2, W/2)
    r1 = im1.rotate(random.randint(5, 145))
    im0.paste(r1, (x, y), r1)
  
  def make_image():
    im = Image.new('RGB', (W, W), color=(0, 0, 0))
    ml = make_master_line()
    for i in range(NLINES):
      add_line(im, ml)
    im.save('f.png')
  
  make_image()
  
subject: Add better glowing line script; uses alpha to create the line out of solid green; handles intersections well