The hex color #51a289 is a light color. The web-safe version is Hex
#669999. A complementary color is
#AE5D76. The grayscale version is
#7F7F7F. A 20% lighter version of the original color is
#84D5BC, and Hex
#1E6F56 is the 20% darker color. If the color is saturated by 10%, you get
#4CA68A. If the color is desaturated by 10%, the color
#569E88 is obtained.