How would I create something like this?
Discussion
Although having a dark room has already been mentioned, take a shot without the flash firing (or turn the light you are using off). The image should be completely black. Introduce the flash/light and adjust the flash/light until you get the desired affect. Flash would be my recommended route as you have more control over the output. As well as adjusting the flash you can move it. Further away gives less light, nearer...well I'm sure you can work that out.
Good luck!
Good luck!
Flash off to the side and slightly in front, F8 and 1/250 (to get the background black). Would look better with the flash higher I know, but this was just a quick test and the flash was on the floor. The room lights were on, so as Rob points out you don't need complete darkness (would make focussing tricky!).

IMG_6750 r by Ian J Bradshaw, on Flickr

IMG_6750 r by Ian J Bradshaw, on Flickr
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