Text coloring and size:
[b]For bolding: [b] TEXT [/b]
For centering: [center] TEXT [/center]
For Horizontal Lines though: [hr] TEXT [/hr]
[big]for big text[/big]
[small]for small text[/small]
[color:colorcode]for coloured text[/color]
[url] bla bla [/url]
Example:[ url=http://www.Somelink.com ] text [ /url ]

About colors:

BLUE [COLOR:0000FF] [/color]
GREEN [COLOR:00BF00] [/color]
LIGHT BLUE [COLOR:40FFFF] [/color]
VIOLET [COLOR:8040FF] [/color]
RED [COLOR:BF0000] [/color]
ORANGE [COLOR:BFBF40] [/color]
WHITE [COLOR:FFFFFF] [/color]
BLACK [COLOR:000000] [/color]