The hex color #a66fcd is a light color. The web-safe version is Hex
#9966CC. A complementary color is
#599032. The grayscale version is
#A1A1A1. A 20% lighter version of the original color is
#D9A2FF, and Hex
#733C9A is the 20% darker color. If the color is saturated by 10%, you get
#A76AD1. If the color is desaturated by 10%, the color
#A574C9 is obtained.