I've been searching for hours and can't seem to find a way to do what I want, so am hoping someone here will show me what a fool I've been and provide a quick and simple solution

My store consists of 17 product lines (sub-sub-categories) divided into 3 sub-categories.

I would like the center panel of my store homepage to display All 17 product lines along with their assigned image.

Whether the category & sub-category names are displayed is really irrelevant to me, I just want my customers to be presented with a grid presenting all 17 product lines, each a single click away.

-Aahz