The hex color #6b8b9c is a light color. The web-safe version is Hex
#669999. A complementary color is
#947463. The grayscale version is
#868686. A 20% lighter version of the original color is
#9EBECF, and Hex
#385869 is the 20% darker color. If the color is saturated by 10%, you get
#688C9E. If the color is desaturated by 10%, the color
#6E8B9A is obtained.