The hex color #677a4c is a dark color. The web-safe version is Hex
#666633. A complementary color is
#9885B3. The grayscale version is
#646464. A 20% lighter version of the original color is
#9AAD7F, and Hex
#344719 is the 20% darker color. If the color is saturated by 10%, you get
#677C4A. If the color is desaturated by 10%, the color
#67784E is obtained.