Hi and welcome to Zorin!
First off if you mean the Zorin Theme Changer I think this is a proprietary piece of Zorin software which cannot be tweaked but there are alternative ways at changing things around and it might be trial and error - Gizmuntu is the resident 'theme' expert here!
If you like to experiment (and would also like wider scroll bars in your browser!) install 'GNOME Color Chooser - open a terminal (Menu | Accessories | Terminal or Ctrl+ Alt+ T) and enter:
- Code:
sudo apt-get install gnome-color-chooser
It places the program under Menu | System Tools | Preferences.
If you open up 'Synaptic Package Manager' (just type in 'Synaptic' in the search box of the Win 7 menu - and click on it - you will be prompted for your login password - look for:
Gtk-Ch Theme to change themes which may just have some orange in them!
Enjoy!