Text, single letters and other type can be used to design an attractive background.
Use the Text Editor to add text objects to an empty page in Page Editor.
Apply Image Tools such as color and rotate.
Choose a high transparency factor, e.g. 70% or more.
Select all objects and click Copy on the toolbar to copy to the Windows clipboard.
Switch to Image Archive mode.
Click Paste on the toolbar to store the object in the Image Archive. This will create a new image comprised of all text objects, which can be used as the background for any page.