new_contents: from AppKit import *
  from lib.tools.misc import randomColor
  
  # get the application icon image
  icon = NSApp().applicationIconImage()
  # get the size
  w, h = icon.size()
  # make a rect with the size of the image
  imageRect = NSMakeRect(0, 0, w, h)
  # create a new image with the same size
  new = NSImage.alloc().initWithSize_((w, h))
  # lock focus on the image to draw in 
  new.lockFocus()
  # draw the original iamge
  icon.drawInRect_(imageRect)
  # get a bright random color
  randomColor(asNSColor=True).set()
  # draw the color over the source 
  NSRectFillUsingOperation(imageRect, NSCompositeSourceAtop)
  # draw the image again
  icon.drawInRect_fromRect_operation_fraction_(imageRect, imageRect, NSCompositePlusLighter, 1)
  # un lock the image, drawing is done
  new.unlockFocus()
  # set the image as the application icon
  NSApp().setApplicationIconImage_(new)
subject: add random app icon color