One of the first design concepts you learn is contrast. Complementary colors are located on opposing sides of the color wheel. Finding colors that go together but create contrast is a key step in designing a space. Therefore it may seem counterintuitive to do it with only one color. However, we are seeing more and more rooms that play on variations of a single color. These spaces are immersive, moody and shocking.
Monochromatic rooms set the mood immediately and without question. That mood, depending on the color, can range anywhere from bright and whimsical to sleek ultramodern. Monochrome also brings the added benefit of allowing your accents and fixtures to stand out where they might otherwise go unnoticed.