The hex color #687a39 is a dark color. The web-safe version is Hex
#666633. A complementary color is
#9785C6. The grayscale version is
#5E5E5E. A 20% lighter version of the original color is
#9BAD6C, and Hex
#354706 is the 20% darker color. If the color is saturated by 10%, you get
#697D35. If the color is desaturated by 10%, the color
#67773D is obtained.