Just did this one right now. I found some good images of number 18 and felt I couldn't pass trying to make a wallpaper with them. These are two of such images. Let me tell you adding that background was kinda rough, since I cut it out of a completely unrelated picture, and it was pretty awful, I worked real hard on making it look like it is, which, trust me is a lot better than it looked before. ...Trust me.

You know she's not really an android? See, androids though designed to resemble a human are completely made of man made material. Her and number 17 are actually humans enhanced with cybernetic parts. The only one who is really an android is number 16.

On top of the work with the background I also changed the colors on the number 18 lying down to make it fit more with the brighter colors of the background.

Yep... full screen version has black bars. But you know... if your monitor resolution is a full screen resolution, then fughedabotit