Nostalgia is a Little Printer publication that delivers a photo from your Flickr photostream from today's date, any year in the past.
It's a simple Rails application that's designed to run on Heroku.
Add your Flickr keys, and a new secret token for Rails. To generate a
token, open the Rails console and type
cp config/env.yml.example config/env.yml
Create a Heroku app with a Postgres database. One dyno should be enough, and a free dev database. You should probably also add the Logentries TryIt and New Relic add-ons to gain some insight.
Nostalgia uses the Dalli gem to
connect to a Memcached store. Get the free Memcachier add-on on Heroku
heroku addons:add memcachier:dev.