Our module is looking good. Why not add an icon to it to make it look even better? For that we just need to add to the module a static/description/icon.png file with the icon to use.

The following commands add an icon copied form the core Notes module:

$ mkdir -p ~/odoo-dev/custom-addons/todo_app/static/description
$ cd ~/odoo-dev/custom-addons/todo_app/static/description
$ cp ../odoo/addons/note/static/description/icon.png ./

Now, if we update the module list, our module should be displayed with the new icon.