The hex color #81bcdb is a light color. The web-safe version is Hex
#99CCCC. A complementary color is
#7E4324. The grayscale version is
#B3B3B3. A 20% lighter version of the original color is
#B4EFFF, and Hex
#4E89A8 is the 20% darker color. If the color is saturated by 10%, you get
#7CBDDF. If the color is desaturated by 10%, the color
#86BBD7 is obtained.