You can only change the color of the auto message either by using color tags before the personal message or use the registry setting.
quote:
Originally posted by http://www.msgpluslive.net/help/registry/
\Preferences - AutoMsgTextColor - dword - RGB(80,120,170)
Color of the text inserted in the chat window when automatic messages are sent by personalized statuses. This is a COLORREF value.
Others are not possible.