The hex color #6b6d9b is a dark color. The web-safe version is Hex
#666699. A complementary color is
#949264. The grayscale version is
#7C7C7C. A 20% lighter version of the original color is
#9EA0CE, and Hex
#383A68 is the 20% darker color. If the color is saturated by 10%, you get
#696C9E. If the color is desaturated by 10%, the color
#6D6E98 is obtained.