The hex color #66969c is a light color. The web-safe version is Hex
#669999. A complementary color is
#996963. The grayscale version is
#888888. A 20% lighter version of the original color is
#99C9CF, and Hex
#336369 is the 20% darker color. If the color is saturated by 10%, you get
#63979E. If the color is desaturated by 10%, the color
#69959A is obtained.