I run 3 screens at home (2x 19" and a 24", with almost 4000px in width total), so I usually cycle between a few every now and then to keep things interesting.
My current one:
I usually put this one on during the summer:
This one is usually set during the winter:
Yes, I usually put the opposite of the current season. I'm weird that way.
The desktop isn't actually perfectly rectangle, but I have an algorithm set up with Photoshop so that the desktop wallpaper
appears to be one continuous image despite the different screen heights and pixel pitches, taking into consideration the bezels of the screens as well.