Ever since the camera-function for the new DSi was announced, it's always been a source of curiosity how this could be used in-game. Well, now we have a fine example for that precise activity, thanks to Sushi Go Round.
Sushi Go Round is based on a popular web game wherein you play the sushi chef, ready to take orders from demanding and impatient customers. Where does the DSi camera function fit? You can take pictures of your friends/family/pets/ anyone - and use their pictures to "give some life" to the faces of your customers. Now that's personalizing your game.
Here are some screenshots: