I found a cool software developed by action script 3.0. It's called PQ talking photo, and it could create animated characters from photos and make them speak.You can let your dog say anything you want or sing a merry Xmas song.
You can play the same magic to your friends online photo and make them laugh.
Luckily,the software is offering a promotion,anybody mentioned it on their blog will get a free version.
Refer to
http://www.pqdvd.com/talkingphoto/blogit.html