# Put this in your custom templatetags file

@register.inclusion_tag('app/boolean_flag_img.html')
def boolean_img(flag):
    return {'flag': flag}

# Use as your 'boolean_flag_img.html' file
{% if flag %}
<img src="/media/icons/accept.png" alt="True" />
{% else %}
<img src="/media/icons/deny.png" alt="False" />
{% endif %}