Using Colours
You can add coloured text to all communication.  To add colour you need to use keywords enclosed by %^ on both sides.  Everything after the keyword will be that colour.  *Note: Not everyone will see the same colours. It all depends on what program they are using.
Keyword Sample  |  Bold    
RED TEST  |  TEST   B_RED TEST   TEST
MAGENTA TEST  |  TEST B_BLUE TEST   TEST
BLUE TEST  |  TEST B_ORANGE TEST   TEST
ORANGE TEST  |  TEST B_YELLOW TEST   TEST
YELLOW TEST  |  TEST B_GREEN TEST   TEST
GREEN TEST  |  TEST B_MAGENTA TEST   TEST
BLACK TEST  |  TEST B_BLACK TEST   TEST
WHITE TEST  |  TEST B_WHITE TEST   TEST
CYAN TEST  |  TEST B_CYAN TEST   TEST
 
RESET Resets colour back to default.
BOLD Used with a colour keyword to get bright colours.
FLASH Causes text following it to blink.

Examples
tell marvin Want some %^YELLOW%^buttered %^WHITE%^%^BOLD%^popcorn? Bob tells you: Want some buttered popcorn?
emote holds his breath until he turns %^B_BLUE%^%^CYAN%^blue. Bob holds his breath until he turns blue.
say I am %^MAGENTA%^SUPER%^RESET%^MAN!! Bob says: I am SUPERMAN!!