The hex color #8b66d6 is a dark color. The web-safe version is Hex
#9966CC. A complementary color is
#749929. The grayscale version is
#989898. A 20% lighter version of the original color is
#BE99FF, and Hex
#5833A3 is the 20% darker color. If the color is saturated by 10%, you get
#8A61DC. If the color is desaturated by 10%, the color
#8C6BD0 is obtained.