Hello

You can try add the following to the Custom CSS field of your templates parameters where '#' is the URL to your image...

ul.mybullet li {

    background: transparent url("#") no-repeat scroll left center;

    list-style: outside none none;

    padding: 6px 22px;

} 

You can then create your list with the following markup..

<ul class="mybullet"><li>Your list item goes here!</li></ul> 

Ciarán