The hex color #51a885 is a light color. The web-safe version is Hex
#669999. A complementary color is
#AE577A. The grayscale version is
#7F7F7F. A 20% lighter version of the original color is
#84DBB8, and Hex
#1E7552 is the 20% darker color. If the color is saturated by 10%, you get
#4CAC86. If the color is desaturated by 10%, the color
#56A484 is obtained.