The best part of this color combination is that there are many different shades of blue, and they all go well with black. You can also experiment with different textures of black, use a shiny or matte coating, playing on the grayscale transparency. Use one color as the primary (eg, paint their walls, or use in the upholstery of furniture), and let there be a different color for accents (pillows, vases, curtains).
You can start with the bathroom – just hang a blue and black towels and see how they fit together. If you like, continue to experiment on the tile, plumbing fixtures, blinds.
To the black walls are not made to the interior gloom, use the black combined with white and add a “distraction” third color – turquoise. These turquoise doors make the room brighter, even with the black walls.
The blue chairs, tableware, kitchen drawers are one entity in the example with the dining room. They dilutes so with a darker tone (table, furniture) that blue color is as the base in the interior.
Of course, more familiar to us to use the blue for the walls, and black – in the decor elements, rather than vice versa. Do not forget to add white to create the effect of lightness. Especially important is the combination of the bedroom.
Try to play with patterns and prints, which include both colors at once. These patterns look very noble and restrained.
It is interesting to look blue in combination with black and white stripe print, or a zebra.