Use these tags in any text field:
<aqua>
<gold>
<red>
<green>
<yellow>
<white>
<gray>
<#RRGGBB>
<#FF5500>
<gradient:#color1:#color2>
<bold>
<italic>
<underlined>
<strikethrough>
<obfuscated>
<reset>
Examples:
<gold>Gold <bold>Bold</bold> Text
<#FF5500>Custom Color
<gradient:#FF0000:#0000FF>Red to Blue</gradient>