Adding an image to each wp_list_pages result

I’m trying to figure out how to add an image to each result when using wp_list_pages. I’m going to style the image so it appears under the name of the page.

Basically I want wp_list_pages to kick out something like:
<li>Link text <div class="link-image"><img src="img-url" /></div></li>

I’m open to doing this however. The method I’m trying is to make a custom field for pages where HTML for an image can be pasted and called in the wp_list_pages loop, something like this:

$meta_key="menu_image";
  echo wp_list_pages("title_li=&child_of=".$post->ID."&echo=0&link_after=".$meta_value);

But it doesn’t work. I’m not married to this approach. For example, if there’s a plug in or any other method that will give me what I need I’ll do that instead…