Okay, so I know what you're thinking. You're saying ''No way! I couldn't do that. That's to hard" Since when did you give up?
The Camera rotate/spin technique is something that everyone can do. This is how you do it.
First, make sure you have your camera set underexposed. That's right. Underexposed. Why? I'll tell you in a minute. Second, open your aperture to F.6.5 or F.2.9 because the smaller the number the more light it let's in. That why you want to set your camera at underexposed.
Third, set your shutter speed at a relatively small speed. Meaning, probably near 30/100 sec. However, you need to be careful with setting it, considering that you want to let more light in in order to make it work.
That all you have to do. Now turn the camera upside down and press the shutter button halfway down to focus. Then quickly rotate the camera or spin the camera, while pressing the shutter the rest of the way down. Using the flash is critical in some areas of interest but it does not have to be on.
Now if you do this you'll notice that you get lines. Spin lines or rotate lines. Usually the direction that the lines are rotating, that's the way you spun or rotated your camera.