The hex color #e9f3d5 is a light color. The web-safe version is Hex
#FFFFCC. A complementary color is
#160C2A. The grayscale version is
#E6E6E6. A 20% lighter version of the original color is
#FFFFFF, and Hex
#B6C0A2 is the 20% darker color. If the color is saturated by 10%, you get
#E9F4D3. If the color is desaturated by 10%, the color
#E9F2D7 is obtained.