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The entire class of 3-A (with Kotarou) from Mahou Sensei Negima!
I dug this up from my "Photoshop Folder" cleaning, it was one of the first things I actually made. I distorted the background for some specific purpose, I'm pretty sure it was for another creation of a theme like "a picture from the past" or something to that sort, but I won't bother any of you guys with the details.
Anyway, it's a nice and simple wallpaper.