Question: I would like to customize the files and folders created when running 

```
python manage.py startapp appname

```

I find doing some things over and over again and I think it would be neat, if my customizations are present when I create a new app. 

Do you know where I can customize the default files when an app is created?

Answer: 
The files are in `django/conf/app_template` and `django/conf/project_template` for the app and project files respectively.

I don't think there is a ways to override this location without either creating your own `startapp` / `startproject` command or without modifying `django/core/management/base.py`.
You can copy your customized files instead of using the created ones without problem.