You have a number of choices.
If you want to make the change system-wide to the actual theme file itself, then edit the file: /usr/share/themes/Redmond/gtk-2.0/gtkrc and replace the line:
...
Type: Posts; User: Toz; Keyword(s):
You have a number of choices.
If you want to make the change system-wide to the actual theme file itself, then edit the file: /usr/share/themes/Redmond/gtk-2.0/gtkrc and replace the line:
...