You could have downloaded FlickrWallpaperRotator 1.0 from our software library for free. This free program is an intellectual property of Rush Frisby. The software is categorized as Desktop Tools.
From the developer:
Specify a Flickr username or tags which the program will use to download wallpapers to your computer. You can have it rotate the wallpaper at regular intervals, like once a day for example.
It's an executable program which will run in your system tray. You can place a shortcut to it in your Startup folder if you want this to start every time your computer starts.
You may want to check out more software, such as zedg, which might be similar to FlickrWallpaperRotator.