Yesterday evening I spoke at Dutch Dynamics Community event, on invitation by my dear friend Luc van Vugt, and the topic was control add-ins for NAV 2013 R2. Of course, this automatically meant that the audience should see more JavaScript code than C# or C/AL, and that it should be something both fancy and useful.
So how about this: you drag and drop a file onto an NAV page, and the file is automatically uploaded and stored in a BLOB field in the NAV database? And yes, it does the same no matter if you call it from the Windows or the Web client. And yes of course, no external components or dependencies needed.