The ten pics above are quick snapshot examples, but you get the idea - its about the layer of darks against each other, which, when viewed "in person" helps to actually illuminate and feature the subtle differences in the dark tones, making for a rich, more-interesting-than-you-would-think effect.
It can veer easily into a goth-y kind of vibe as many of these examples illustrate; it's not an easy look to pull off. I think the key to making this work in a "real" home would be to consider the overall fussiness of the pieces - cleaner lines work better and going for variances in finishes and textures would help to keep it feeling more warm and cozy instead of overly nightclubby.
What do you think? A do-able look or just too theatrical for real life?