Snaptivity - Real-time photo sharing with the world nearby
Wallpaper Engine - Wallpaper Engine enables you to use live wallpapers on your Windows desktop.
Flashgap - Time-delayed photo-sharing app of last night's embarrassment
Lively Wallpaper - What is it? Lively is a Free and Open-Source Software (FOSS) for animated desktop wallpapers.
Poparazzi - Take photos of your friends
ScreenPlay - Open-source and cross-platform Wallpaper, Widgets and AppDrawer app.