The hex color #51a945 is a light color. The web-safe version is Hex
#669933. A complementary color is
#AE56BA. The grayscale version is
#6A6A6A. A 20% lighter version of the original color is
#84DC78, and Hex
#1E7612 is the 20% darker color. If the color is saturated by 10%, you get
#4EAF41. If the color is desaturated by 10%, the color
#54A349 is obtained.