DisplayFusion

If you usually work with more than one monitor plugged to your computer, for sure that more than once you'll have missed some more configuration settings than those offered by default by Windows. And here's where DisplayFusion comes in: a useful app that allows you more accurately define your ideal monitor setting.

Among its many features, DisplayFusion allows you to adapt the specifics of a screen wallpaper to your monitor, for instance, by escalating its size or setting different images for each monitor (if you're using more than one).

Furthermore, DisplayFusion offers a link to Flickr, so you can download any image to serve as your desktop's wallpaper.