* Detect monitor resolutions and set the desktop wallpaper, for any
  window manager (please file an issue if your window manager is not
  supported yet).
* Supports GNOME timed wallpapers, and includes a utility that can run
  an event loop for changing them (also supports cross fading).
* Introduces a new file format for timed wallpapers

WWW: https://github.com/xyproto/wallutils