The hex color #81b29a is a light color. The web-safe version is Hex
#999999. A complementary color is
#7E4D65. The grayscale version is
#9A9A9A. A 20% lighter version of the original color is
#B4E5CD, and Hex
#4E7F67 is the 20% darker color. If the color is saturated by 10%, you get
#7FB49A. If the color is desaturated by 10%, the color
#83B09A is obtained.