How to use HTML template for list columns

simple.py

from flask import Flask
from flask.ext.sqlalchemy import SQLAlchemy

from flask.ext import admin, wtf

from flask.ext.admin.model import template
from flask.ext.admin.contrib import sqlamodel
from flask.ext.admin.contrib.sqlamodel import filters

# Create application
app = Flask(__name__)

# Create dummy secrey key so we can use sessions
app.config['SECRET_KEY'] = '123456790'

# Create in-memory database
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///test.sqlite'
app.config['SQLALCHEMY_ECHO'] = True
db = SQLAlchemy(app)


# Create models
class Color(db.Model):
    id = db.Column(db.Integer, primary_key=True)

    name = db.Column(db.String(32))
    value = db.Column(db.String(8))


# Flask views
@app.route('/')
def index():
    return '<a href="/admin/">Click me to get to Admin!</a>'


# Color admin with custom template
class ColorAdmin(sqlamodel.ModelView):
    # Force specific template
    list_template = 'color_list.html'
    create_template = 'color_form.html'
    edit_template = 'color_form.html'

    # Customize list view to call 'color' macro for value column
    list_formatters = dict(value=template.macro('color'))

    # Use select field for value column
    form_overrides = dict(value=wtf.SelectField)

    form_args = dict(value=dict(
        choices=[
            ('#000000', 'Black'),
            ('#ffffff', 'White'),
            ('#ff0000', 'Red'),
            ('#00ff00', 'Green'),
            ('#0000ff', 'Blue'),
        ]))


if __name__ == '__main__':
    # Create admin
    admin = admin.Admin(app, 'Simple Models')

    # Add views
    admin.add_view(ColorAdmin(Color, db.session))

    # Create DB
    db.create_all()

    # Start app
    app.debug = True
    app.run('0.0.0.0', 8000)

templates_color_form.html

{% extends 'admin/model/edit.html' %}

{% block head %}
    {{ super() }}
    <link href="{{ url_for('static', filename='simplecolorpicker.css') }}" rel="stylesheet">
{% endblock %}

{% block tail %}
    {{ super() }}
    <script src="{{ url_for('static', filename='jquery.simplecolorpicker.js') }}"></script>

    <script language="javascript">
        $('select#value').simplecolorpicker();
    </script>
{% endblock %}

templates_color_list.html

{% extends 'admin/model/list.html' %}

{% macro color(model, column) %}
<div style="width: 16px; height: 16px; border-radius: 5px; background-color: {{ model.value }}">&nbsp;</div>
{% endmacro %}