The hex color #66a88f is a light color. The web-safe version is Hex
#669999. A complementary color is
#995770. The grayscale version is
#8A8A8A. A 20% lighter version of the original color is
#99DBC2, and Hex
#33755C is the 20% darker color. If the color is saturated by 10%, you get
#62AB90. If the color is desaturated by 10%, the color
#6AA58E is obtained.