I did not understand why this feature has not been integrated in all the FP2 devices!! But if you have dugg deep into your N85 or N78, you would have noticed the Audio Themes catagory in the Themes section in Settings.
The themes range from sports (Football, Golf), music (Hip-Hop, Hard Rock, Orchestral,Punk) and various others.
Try out the Chinese and Video Game themes.
Nokia Europe - Audio themes - Support
Nokia provides 4 Audio Themes out of the box on the N85. But on their website, they provide around 15-20 more audiothemes on different themes. A must try, some of them are sure to be of your liking.Audio themes feature allows you to personalize the user interface sounds of your phone. Audio themes are offered in packages which contain several sound files of a common theme. The packages contain usually the normal profile sounds (e.g. ringing tones, message alerts, clock alert, calendar alarm) but also sounds for phone handling (e.g. fold open, fold close) and menu events (enter menu, leave menu).
The themes range from sports (Football, Golf), music (Hip-Hop, Hard Rock, Orchestral,Punk) and various others.
Try out the Chinese and Video Game themes.
Nokia Europe - Audio themes - Support