I don't know how much work you would have to put in to do this, but I think it would be really cool to have the storyline, or just the pictures change slightly, depending on which side of the picture you click on with the actual cursor. I loved discovering that you could choose which side corrected to the other, and if that had an effect on the next picture you could have some great replay-ability.
 "Music Box of Life 3"){kind=icon}
 "My \"Dear\" Boss"){kind=icon}
 "Achievement Unlocked"){kind=icon}