Should you want to use a photograph as screen wallpaper, here are a few in 3 monitor resolutions.
To use any one as a wallpaper, open the size corresponding to your screen resolution, right click on the picture and click "Set as wallpaper". The commands are a little different with a Mac.
Bear in mind that these images are optimized for quality rather than download time are quite large (between 100 and 300 Kb for the 1024 pixel size) and will take a little bit of time to download.

I hope to be able to rotate them from time to time with different pictures so keep coming.