The hex color #81b29b is a light color. The web-safe version is Hex
#999999. A complementary color is
#7E4D64. The grayscale version is
#9A9A9A. A 20% lighter version of the original color is
#B4E5CE, and Hex
#4E7F68 is the 20% darker color. If the color is saturated by 10%, you get
#7FB49B. If the color is desaturated by 10%, the color
#84B09B is obtained.