I use those buff tones as neutrals in the whole garden scheme.They also act asa break when the eye is going from one area of color to another. My gardens seem to be mostly the mid tone saturated color and many plants were gifts so composition was taken pretty much out of my control. I'm not excusing or defending here.Thats just how things grew "like Topsy"
I tried to keep color families together and disperse lights against darks, solids against patterns.