The hex color #a666df is a light color. The web-safe version is Hex
#9966CC. A complementary color is
#599920. The grayscale version is
#A4A4A4. A 20% lighter version of the original color is
#D999FF, and Hex
#7333AC is the 20% darker color. If the color is saturated by 10%, you get
#A660E5. If the color is desaturated by 10%, the color
#A66CD9 is obtained.