A JavaFX "Picture Puzzle" app that is integrated with Facebook is featured In a blog post by Sharon Zakhour. Not only is it graphically pleasing and smooth operating (wasn't that a song performed by Sade?), but it "lives" in Facebook, and makes jigsaw puzzles out of your Facebook friends' profile pictures. It uses the Facebook API, and it was developed by Sun.
By the way, if anyone knows whether the source code is available, please post a comment, as it would be a great learning example.
Check this JavaFX Facebook app out and puzzle all of your friends! :-) That was lame, but it's Friday.