This is just a simple blog, which uses Sinatra + PostgreSQL + Heroku + ActiveRecord + Tux + Bootstrap: http://sinatra-sings.herokuapp.com/
Want to view the tutorial on how I built it?
Well, at the very least, download the app and add some features (editing/deleting posts, user login/logout/authentication)
$ git clone https://github.com/mjhea0/sinatra-blog $ cd sinatra-blog $ bundle install $ ruby app.rb
Then open http://localhost:4567/
Fork. Star. Applaud. Build.