Running my girlfriend's recipe blog on Python + Django + Wagtail CMS on a Heroku server, wired up to Google cloud storage. It ends up being completely free with the dev tier Heroku server and staying within the free tier of Google's cloud storage.
It was mostly as a learning exercise, but it's a pretty flexible stack, and I'm a fan of the Wagtail admin panel; didn't really feel the need to customize anything there.