Windows 7: Themes for All Users?

Hi - I am wondering how I can make the themes that show up in my personalization screen, under My Themes, show up for all the other users on the computer. I don't want to individually change each theme, I have too many (in the hundreds) to do that. Rather, I want the themes to be a shared folder where when I add a theme in my personalization screen it will show up on the other user's personalization screen automatically without having to do anything. Any help would be greatly appreciated. Thanks.