--- /dev/null
+{#
+/**
+ * @file
+ * Default theme implementation to present a list of custom block types.
+ *
+ * Available variables:
+ * - types: A collection of all the available custom block types.
+ * Each block type contains the following:
+ * - link: A link to add a block of this type.
+ * - description: A description of this custom block type.
+ *
+ * @see template_preprocess_block_content_add_list()
+ *
+ * @ingroup themeable
+ */
+#}
+{% spaceless %}
+ <dl>
+ {% for type in types %}
+ <dt>{{ type.link }}</dt>
+ <dd>{{ type.description }}</dd>
+ {% endfor %}
+ </dl>
+{% endspaceless %}