$query = new WP_Query('category_name=foobar&post_status=publish&showposts=5');
foreach($query->posts as $spost)
{
    $children =& get_children('post_type=attachment&post_mime_type=image&post_parent='.$spost->ID);
    foreach($children as $child)
    {
        echo wp_get_attachment_thumb_url($child->ID);
        echo wp_get_attachment_url($child->ID);
        //etc...
    }
}