I think you should take the complete opposite approach. Completely overload it with porn! Your user icon? Porn! Your desktop background? Porn! The videos in your iTunes library? Porn! Your Movies folder? Porn! Your iPhoto library? Porn! Your pictures folder? Porn! Your iMovie library? Porn! Your homepage? Porn! Your bookmarks? Porn! Your RSS feeds? Porn! Your Top Sites? Porn! Custom icons? Porn! Your iCal events? Watching porn! The last text entered into Spotlight? Porn! The last thing you looked up in Dictionary.app? Porn! DVD left in the computer? Porn! Recent items? Porn! Name of your HD? Porn Storage! Username? Porn Man! Photo Booth? Hilariously distorted porn!
It would be funny! Or, alternatively, it would mask all your porn as just part of the joke!
Brilliant!