We have a pretty good application deployed online but it's not uber useful nor original until you make it so.
Try to make it better and more personal. Once you're proud of your achievement, tweet your application URL with the #masterspringmvc
hashtag on Twitter.
Try to push the best application possible. There is so much that we didn't do. Here are some ideas:
Let your imagination fly!
My version of the application is deployed on http://masterspringmvc.herokuapp.com. I will improve some details to make the application a little more reactive. Try to spot the differences!