Desktop photos and the inner world

Has anyone done an ethnographic study of the desktop photos on peoples' PCs and laptops? I'm sure that they'd reveal a lot about: an individual's deepest interests, mindset, how they want to be seen, how they see themselves, how technologically sophisticated they are. Do they use an anonymous downloaded desktop wallpaper or a personal photo? It would bring a whole new meaning to desktop research. Why the fascination with making your desktop a full bleed window on somewhere else? Your last holiday, gig, party, the Microsoft deep green hill somewhere far away. Well this is my desktop photo. Make of it what you will.