Desktop Background Changer (Nature Edition) will give you awesome 20 wallpapers chosen specially for for you to switch between them as you like to change your mode.
It's Free, Light and Simple to use application.
Full Specifications
What's new in version 1.0
General
ReleaseSeptember 22, 2014
Date AddedSeptember 22, 2014
Version1.0
Operating Systems
Operating SystemsWindows 2003, Windows Vista, Windows 98, Windows Me, Windows, Windows 2000, Windows 8, Windows Server 2008, Windows 7, Windows XP