Cortina
Cortina is a lightweight wallpaper manager/slideshow software for Linux that changes your desktop wallpaper using images you have selected, at an interval that you set. Cortina lets you create an 'Ubuntu Wallpaper Slideshow' on your desktop. Cortina is an easy to use tray application, written in C++, using a QT GUI, and a file-system watcher. Cortina is an alternative to Drapes, Wallpaper-Tray and Wally.
You can install using the .debs from the launchpad page below, or the following PPA: With the .deb install method you will not get automatic updates, with the PPA you will.
If you installed using the PPA or .deb method above
Screenshots
Installation
sudo apt-add-repository ppa:cs-sniffer/cortina
sudo apt-get update ; sudo apt-get install cortina
Uninstallation
sudo apt-get remove cortina
Further Reading