gbackground software package provides interval-based gnome background changer, you can install in your Debian 7 (Wheezy) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install gbackground
gbackground is installed in your system.
Make ensure the gbackground package were installed using the commands given below,
$ sudo dpkg-query -l | grep gbackground *
You will get with gbackground package name, version, architecture and description in a table
| Distro | Debian 7 wheezy |
| Section | GNOME |
| Package | gbackground |
| Version | 1.3-1 |
| Description | interval-based gnome background changer |
| Sub Section | GNOME |