I've searched far and wide across the site trying to find some indication of how to do this, but coming up short everytime.

Here's what I'm trying to do:

In my product descriptions I have several small images, to show the available colours of the product.
I am trying to get these small images into the product listing page but its only allowing text into the product descriptions on these pages.

I've looked at the code for product_listing and the code for tpl_modules_product_listing to try and make changes so that it allows images rather than just text but cannot figure out what I need to do.

Does anybody have any suggestions?!