The hex color #688f7c is a light color. The web-safe version is Hex
#669966. A complementary color is
#977083. The grayscale version is
#7C7C7C. A 20% lighter version of the original color is
#9BC2AF, and Hex
#355C49 is the 20% darker color. If the color is saturated by 10%, you get
#66917C. If the color is desaturated by 10%, the color
#6A8D7C is obtained.