Yes, a 'morey' is needed. A morey (don't know if I am spelling it right) is an illusion created when 2 patterns move upon each other. I see a morey everytime I drive under a pedestrian overpass, and the 2 chainlink fence patterns that line the overpass create a moving illusion...I am easily entertained. anyways-
Basically, in your case, you would need to make a piece of art that could just be a 'scribble' in Photoshop... literally a scribble(with alpha). Bring it into A:M as a layer and place it in front of the lights and give it a little clockwise rotation... now bring another instance/layer in to the same place and rotate this one counter-clockwise. The negative effect they will have on your lights should give the lights a nice 'city at night' twinkle effect. All this assuming you are working in a black scene. Adjust scribble line thickness and rotation speeds to taste. Results may vary. Subject to sales tax.
That is an old film trick.