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For me, it's the same reason I would use anything as my wallpaper - I really like a certain picture and I feel like looking at it on my desktop. I don't know, sometimes I feel like having something badass on there, sometimes - something funny, awesome, inspiring, or, sometimes, I want something pretty to look at.
Here's a question back at you, why would it matter if you know the person or not? You don't know that turtle-sandwich personally, do you? It's just something you like seeing, so you use it as your background. Same thing with girls, at least for me.
