The hex color #a66cc9 is a light color. The web-safe version is Hex
#9966CC. A complementary color is
#599336. The grayscale version is
#9E9E9E. A 20% lighter version of the original color is
#D99FFC, and Hex
#733996 is the 20% darker color. If the color is saturated by 10%, you get
#A767CD. If the color is desaturated by 10%, the color
#A571C5 is obtained.