Comment 14 for bug 1362555

Here is what I did to help with this issue:
Using gimp or another image editor, edit and replace the file:
/usr/share/themes/Lubuntu-default/gtk-2.0/images/panel-bg.png to be 300 by 300 pixels.

Then ising vim, edit:

/usr/share/themes/Lubuntu-default/gtk-2.0/apps/xfce4-notifyd.rc

to change the notify-text color from:

style "notify-text"
{
    fg[NORMAL] = "#ffffff"
    GtkWidget::link-color = "#a7a7a7"
}

To:

style "notify-text"
{
    fg[NORMAL] = "#000000"
    GtkWidget::link-color = "#a7a7a7"
}

This changes the notification text from white to black