The hex color #51a635 is a dark color. The web-safe version is Hex
#669933. A complementary color is
#AE59CA. The grayscale version is
#646464. A 20% lighter version of the original color is
#84D968, and Hex
#1E7302 is the 20% darker color. If the color is saturated by 10%, you get
#4FAD30. If the color is desaturated by 10%, the color
#539F3A is obtained.