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Regardless of the method, the "Appearances Preferences" dialog box will appear. Make certain that the "Background" tab is selected.
You now have the option to select a background, or add a background you may have created. You can also later install various "artwork" if you desire. Refer to the previous menu on "How to Install SoftwareApplications in Ubuntu " for additional help...
= Changing Themes =
You can play with these settings to customize the font appearance of your system. The rendering section allows the user to adjust or "tweak" the font display settings in case you have an older computer display. It is recommended to leave those default settings...
= Changing Icon Text Colour =
If you are using the Gnome desktop environment, it is not as "intuitive" to make simple settings like icon text colour. Although the KDE desktop environment is considered more "user-friendly" for these types of operations, I believe that it is better to work in the Gnome environment. I had used KDE for many years, but eventually came to realize that Gnome provides a "cleaner" interface.
That is a great thing about linux, you can install and use many different desktop environments (such as KDE, Gnome, Xfce, Enlightenment, Open Windows, Project Looking Glass, WorkBench, Mezzo, etc...
Since Gnome was designed to work with gtk (referred to as the "Gimp Tool Kit"), you need to make changes in a file (contained in the user's home directory which is called .gtkrc. The file has a period in front of it which makes the file "hidden" from normal view (like they say "out of sight, out of mind or damage"). The "rc" after "gtk" refers that this file is a "run-command" file. This means that when the Gimp ToolKit application is run (normally at system start-up), it will set the environment of that application by first reading and using settings contained in this file.
Therefore, you will need to use a text editor to make changes to this file. If you try to edit this file, and it is empty, then here is a link to an existing .gtkrc file that I am using on my system. Here is the link: [ [[html]] ]
Simply copy and paste these settings into that file, and save. The changes will take effect when you logout and login to your graphical Linux environment.