Dream Desktop Agent is a free application which will allow you to download Wallpapers from your desktop.
Browse wallpapers by categories, tags or search wallpapers by keywords
Automatic change of wallpapers at specified intervals
Get notified when new wallpapers are added
Add favorite wallpapers to Dream Desktop Favorites for instant access
It will stay on tray and will alert you when ever there is a new wallpaper is available.
Read more and download
[Via webTrickz]