I am ever so lucky to live in a cave-like dwelling! If you stand far enough away from background elements in my house, you end up with a very dark background and through a little contrast increase, it becomes completely black. I used a home depot work light and my flash on my camera (as dim as possible) for lighting and then adjusted with dodge and burn. The lights, of course, are entirely fictional.
I'm so happy to have gotten a comment on this! Not only is it a self-portrait, but I'm also really proud of it!