display all main parent categories(with category images) on a page

Someone wants their "all product page" to just contain his main categories (with category logo's). Sort of like the categories with sub categories opening page but with only all the parent categories. Wondering anyone would know how to do this, or be so kind as to provide the code.. or direct me in the right direction.

admin > Configuration > Layout Settings "Categories - Always Show on Main Page - 1" is what I want on custom made page.
maybe I will find my answer now I am not sure

If I copied
/public_html/planetmobiles.com.au/includes/modules/pages/index/main_template_vars.php
to
/public_html/planetmobiles.com.au/includes/modules/pages/page_2/main_template_vars.php
and set the show all categories to on, then the categories would come up on page_2 but thats about where I go up to