Shoutbox

You can change the messenger registry settings but it won't update until you re-open the window.

EDIT: The two registry settings are as follows in case you did want to know (I think you can work out which is which):

HKCU\Software\Microsoft\MSNMessenger\PerPassportSettings\{MSN ID here}\IM Color
HKCU\Software\Microsoft\MSNMessenger\PerPassportSettings\{MSN ID here}\IM Format