Hello NY by Julia Rothman http://www.book-by-its-cover.com/process/hello-ny-behind-scenes-cover-process

“Hello NY” has a cover by Julia Rothman that serves well as an example of using similar colors in a way to create contrast. The cover uses mostly desaturated colors, with each one being a varying shade of red, orange or pink. Rothman also uses whites to create natural borders around the colors, so that even though they are not saturated, the stand out from one another. The primary exception to this being the yellow-green hue used for the various trees in the art, as they pop out from the rest of the covers art as being highly saturated.

As I touched on early, the white interacts with the various shades of red, being a naturally good border for them, stopping them from bleeding together. These also server as the primary colors, as the eye gets attracted to the hard shapes out in the city to the fore ground. The art in general carries a warmer temperature to it, despite the abundance of white and greys in it. The primary colors are analogous to one another, as you can see they all carry the same sort of “root” color. The way that the colors become desaturated as they get closer to the edge of the top also does well with drawing the reader’s eye back down to the title.