Use the colour chart to find yourself a colour code. Simply click on the colour you want to get the colour code from. You can copy and paste the code from the colour chart to use it for your fonts etc.
If you want to find out the exact colour code from a colour in your avatar, you can try SunnyNeo's Eyedropper Tool Tutorial.
Click the box of the colour you want to use; the hexadecimal number will be shown below.