The hex color #e9f3d1 is a light color. The web-safe version is Hex
#FFFFCC. A complementary color is
#160C2E. The grayscale version is
#E4E4E4. A 20% lighter version of the original color is
#FFFFFF, and Hex
#B6C09E is the 20% darker color. If the color is saturated by 10%, you get
#E9F4CF. If the color is desaturated by 10%, the color
#E9F2D3 is obtained.