What's in a resolution?

Wallpaper resolution is a tricky thing. There are so many different sizes of monitors out there nowadays that it's hard to design for all of them. Generally, you just crop things to the right aspect ratio, which does mean you have to be careful about element placement.
I have a dual widescreen monitor display at work, and generally speaking, this is a rare thing to find. So every so often I make one for myself.
The question was, how do I make this wall look good on dual screens and single screens?
The answer: Move elements around.
I made two wallpapers here: a dual monitor version, and a single monitor version, and then cropped them to fit the relevant aspect ratios.
Dual monitor versions:




Single monitor versions:




It makes a difference, doesn't it?