Twitter Bootstrap layout for menu and breadcrumbs from django-treenav. Dropdown lists are used for submenus. This template ignores "full_tree" flag and works as it is set to True. In other words, full menu with dropdown submenus rendered in any case.

menucrumbs.html

{% load i18n %}{% load url from future %}
{% if active_menu_items %}
    <ul class="breadcrumb">
        {% for item in active_menu_items %}
            <li>
                <a href="{% if item.node.href %}{{ item.node.href }}{% else %}{% url 'treenav_undefined_url' item_slug=item.node.slug %}{% endif %}">
                    {% trans item.node.label %}
                </a>
                {% if not forloop.last %}<span class="divider">/</span>{% endif %}
            </li>
        {% endfor %}
    </ul>
{% endif %}

menuitem.html

{% load treenav_tags i18n %}{% load url from future %}
{% if menuitem.enabled_children %}
<ul id="nav{% if menuitem.node.slug %}-{{ menuitem.node.slug }}{% endif %}"
    class="{% if menuitem.node.is_root_node %}nav{% else %}dropdown-menu{% endif %} depth-{{ menuitem.node.level }}">
    {% for item in menuitem.enabled_children %}
        <li id="menu-item-{{ item.node.slug }}"
            class="{% if item.active %}active{% else %}inactive{% endif %}
                   {% if not single_level and not item.node.is_leaf_node %}{% if item.node.level == 1 %}dropdown{% else %}dropdown-submenu{% endif %}{% endif %}">
            <a {% if not single_level and not item.node.is_leaf_node %}class="dropdown-toggle" data-toggle="dropdown"{% endif %}
               href="{% if item.node.href %}{{ item.node.href }}{% else %}{% url 'treenav_undefined_url' item_slug=item.node.slug %}{% endif %}">
                    {% trans item.node.label %}
                    {% if not single_level and not item.node.is_leaf_node %}{% if item.node.level == 1 %}<b class="caret"></b>{% endif %}{% endif %}
            </a>
            {% if not single_level and not item.node.is_leaf_node %}{% render_menu_children item %}{% endif %}
        </li>
    {% endfor %}
</ul>
{% endif %}