A windows tray app which rotates wallpaper based on the chromecast-backgrounds backgrounds.json format (included with the kind permission of Deirdre Connolly).
Please note the images can be very large, so watch your data usage!
Windows tray code based on Creating Tray Applications in .NET - A Practical Guide by Michael Sorens.
An installer can be downloaded from the releases section on github. Just unzip and run setup.exe, and the program will be in your system tray.
Written in C# using JSON.NET and Visual Studio 2013.