Preview looks like the real page, but the links lead to an oops dialog warning users of not-yet-saved topics. In addition, a background with a "PREVIEW" watermark is shown to have visual clue that you are previewing a topic. You can change the background image by specifying the name of an attached background image file in the PREVIEWBGIMAGE variable in the TWikiPreferences.
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You also could attach a new image file to this topic.
You can override the PREVIEWBGIMAGE preference variable in your personal home page.
You can override the PREVIEWBGIMAGE preference variable in your user profile page.