Lessons from my 365: 3 values of the same hue

A monochromatic color scheme includes only one hue, but there's nothing that says that every element in the design needs to be the same value of that hue. In fact, very successful designs can be created by manipulating the value of a single hue. Moreover, 3 values seems to be a sort of magic number. Consider the following designs. In each case, just 3 values of a single hue have been used, and yet, the designs are fresh, clean, deep, and uncluttered. These designs are among my favorites from the set of 365.