How to get this abstract light effect? Photography?

How do I set my camera to get this "abstract light" effect? This is what i'm talking about:

http://browse.deviantart.com/photography/?q=lights&order=9&offset=72#/d18c60y

I also have a Nikon D3000

Just point your camera at some Christmas lights, switch to manual focus and play with it until you get it the way you want.

First, you need a very cheap lens to get this effect, because there are only 6 blades on the aperture.

There are two things working together to make this image, and it will be different with every lens.

1) Aperture. If you shoot wide open, the lights will be round. But if you stop down to f/8 to f/16, you will start to get the hexagonal shape here.

2) You need to experiment with the focus to get just the right amount of blur in the images.

This EFX is also referred to as Bokeh… It is the often un-seen but 'seen' part of a image of the out of focus background behind the main item of interest.
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Some lenses are noted for either their good Bokeh or their bad Bokeh. The Bokeh is caused, made or such by the shape of your iris IN the cameras lens.
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Use manual on your camera and look at anything giving numerous pin point light sources. Christmas trees are good, if you can still find one.
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On M with your camera, focus in and out and set the f/stop to different settings… However.
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This is digital, you can SEE your results on your view screen. Turn auto focus off and shoot a series of pictures at different f/stops with the camera out of focus. The more out of focus you are the larger the 'dots' will be. Also as you keep the f/stop near 5.6 or 8 they remain 'small'. Now, if you have the out of focus lens focused a tad closer to the lights and use a small f/stop, the dots get smaller too.
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If you focus on a face 3 ~ 4 ft in front of you and these lights are 10 or 15 ft behind the face, you have the magic of Bokeh in your image.
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ANY lens will do this that has a iris in it, cheap or not. No special lens is needed, but as said, some lens are noted for a better Bokeh than others, but better is in the eye of the viewer of the image.
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https://lensmen2.smugmug.com/Photography/Brokeh-tests/7461190_JoY7e.
Note the background picture with the little boy. The out of focus area is called bokeh.
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http://en.wikipedia.org/...wiki/Bokeh.