The hex color #51a586 is a light color. The web-safe version is Hex
#669999. A complementary color is
#AE5A79. The grayscale version is
#7F7F7F. A 20% lighter version of the original color is
#84D8B9, and Hex
#1E7253 is the 20% darker color. If the color is saturated by 10%, you get
#4CA987. If the color is desaturated by 10%, the color
#56A185 is obtained.