Wall Paper Change in Ubuntu

Short description of programs for your choose:

• Walch: (sudo apt-get install wallch) very simple, for those, who just want only program for wallpaper change.
• DesktopNova: (sudo apt-get install desktopnova) - similiar to Walch, little more advanced, but you'll not find in it for example settings of image sizing.
• Variety: (sudo add-apt-repository ppa:peterlevi/ppa && sudo apt-get update && sudo apt-get install variety) - it's advanced wallpaper changer, with all features you'd want from wallpaper changer (sizing, auto-downloading, effects etc.). Just for those, who want something more from wallpaper changer.