Open Source Windows Wallpaper Apps

Sucrose is a versatile wallpaper engine that brings life to your desktop with a wide range of interactive wallpapers.

Wally is a Qt4 wallpaper / background changer, using multiple sources like files, folders, FTP remote folders, Flickr, Panoramio, Ipernity, Photobucket, Buzznet, Picasa, Smugmug, Google, Vladstudio and deviantART images.

SyncWall is quite a basic wallpaper changer with a special feature, it is the ability to synchronize wallpaper change between several workstations with a basic (and unsecured) client/server protocol. Each workstation must share the same pool of files, there is no FTP or Internet download. Because SyncWall is written with Qt, SyncWall runs on Windows and Linux (MacOSX isn't tested yet).

Flying Bird Wallpaper is a feature-rich desktop wallpaper application that supports multiple wallpaper types including images, videos, rhythm wallpapers, and solid colors, making your desktop unique and vibrant.

Meyshan Wall, This is the ultimate wall paper changer, using Micro soft .Net framework, Meyshan wall would fetch public and private photos from Picasa, Flicker, Riya, and 23 Hq and from your local directory to display as wallpaper as per your settings.