The last days I have spent some hours in the evenings to learn me Bootstrap in combination with XPages as bit more. The result is a basic eCard application on XPages which utilizes Bootstrap 2 for UI.
Since the Advent Calendar has started I guess you are allowed to start sending out your seasonal greetings 🙂
You can find the app as a project on OpenNTF (link to project). I noticed a card is not working properly in IE yet (what did I expect?). I will see if I can fix this on the short term. Of course you may contribute to the fix.
Here you can find some inspiration for your messages: http://www.brainyquote.com/quotes/topics/topic_christmas.html