The hex color #81a72f is a light color. The web-safe version is Hex
#999933. A complementary color is
#7E58D0. The grayscale version is
#727272. A 20% lighter version of the original color is
#B4DA62, and Hex
#4E7400 is the 20% darker color. If the color is saturated by 10%, you get
#82AC28. If the color is desaturated by 10%, the color
#80A236 is obtained.