There is something so elegant about simple monochrome designs. The simplicity of such designs do not beg for attention, they do not scream for your validation, they just exist in simple tones of basic colors.
If you have seen my website, you already know that I am a big fan of simplistic and minimal themes. By stripping away all design concerns to a single color or 2, you dramatically reduce the number of decision making of what colors to use and where. It might sound counter-intuitive as you think you need to have a whole set of primary colors and secondary colors and then where does tertiary come in? But you would be amazed to how much you can play around with different shades of the same colors.
The term less is more really comes into play here. When I design something in black and white, it feels honest. It frees me from the distractions and noise and allows me to focus on content rather than color design decisions and that has made all the difference. Maybe that is why we still feel something when looking at old black and white images. We don’t have the richness of high def colors that modern day cameras are able to capture, but we remove the distraction of hundreds of different colors stampeding on our neural systems and instead focus on what matters, the memory.