You have a lot of flexibility on what you can do with the page background, there are three options:
- A solid fixed colour
- A fixed permanent image
- A selection of images where one is picket randomly each time the page is loaded
For a selection of images, save all as JPG files in the /bg directory. One will be selected randomly when the page is loaded. If you only want a single permanent image, just put one image in the /bg directory. You can configure the background image to be repeated or only shown once.
If you don't want a background image, simply leave the /bg directory empty, then the colour selected in the configuration will be used.