written by RJ Wattenhofer
Here is a complete list of all the Bukkit, Worldguard and server MOTD (Message of the Day) color codes you can use in Minecraft. The Bukkit color codes would be used mainly to create colored text on signs. Worldguard colors can be used on things like greeting/farewell messages that will display when a player enters/exits a region.
The MOTD colors are used exclusively when creating your server message and are formatted with a '\' (backward slash) at the beginning and can be combined. EXAMPLE: \u00A79Welcome to our server! \u00A76\u00A7lEnjoy your time here! would give you Welcome to our server! Enjoy your time here!
&0 BLACK
&1 DARK BLUE
&2 DARK GREEN
&3 DARK AQUA/CYAN
&4 DARK RED
&5 DARK PURPLE
&6 GOLD
&7 LIGHT GRAY
&8 DARK GRAY
&9 INDIGO
&A LIME GREEN
&B AQUA/CYAN
&C RED
&D PINK
&E YELLOW
&F WHITE
&L BOLD
&M STRIKETHROUGH
&N UNDERLINED
&O ITALIC
&0 BLACK
&1 DARK GRAY
&2 LIGHT GRAY
&b BLUE
&B DARK BLUE
&c AQUA/CYAN
&C DARK AQUA/CYAN
&g LIME GREEN
&G DARK GREEN
&p PINK
&P DARK PURPLE
&r RED
&R DARK RED
&y YELLOW
&Y GOLD
&w WHITE
u00A71DARK BLUE
u00A72 DARK GREEN
u00A73 DARK AQUA/CYAN
u00A74 RED
u00A75 DARK PURPLE
u00A76 GOLD
u00A77 LIGHT GRAY
u00A78 DARK GRAY
u00A79 BLUE
u00A70 BLACK
u00A7a LIME GREEN
u00A7b AQUA/CYAN
u00A7c PALE RED
u00A7d PINK
u00A7e YELLOW
u00A7f WHITE
u00A7l BOLD
u00A7m STRIKETHROUGH
u00A7n UNDERLINED
Here is a handy Hexadecimal Color Code Chart for additional reference.