This is cool! You asked on my page how I did it? Low aperture, and manual focus. You'll see as you manually focus in and out, the lights getting round or more in focus. You can also focus on something at a low aperture in front of the lights, and they will become that pretty round look you are going for. Does that help? If you have more questions, email me. Put your email address in there as well, so I can answer you back! I hit reply on my comment, but it said no-reply. :)
I think it's neat! It looks like birds flying.
Your birds are a result of camera shake. I have to say though that it looks really cool! You'll get it yet :o)!Blessings!Deborah