title: Cocoa draw noise
body: <p>Is it possible to draw some noise on top of a rect I filled using NSRectFill? I need to make my app that draws a custom title bar look wonderful on 10.7 before release, and to make it look a little more like iTunes. I would love if this is possible using no images, but if I have to include a PNG or something as a mask, I'd be fine with that.</p>
  
  <p>Thanks!</p>