I imagine the FAQ would need the following:
- Links to the features guides:
- Header Image for a list of layouts that have that option in the settings.
- Top Margin and Page Background Image Properties, and an explanation how to put it in action.
- If the user's selected layout isn't one of those covered by the feature guides above, then links to
- Header images memories of S2HowTo and
- Shifting Contents Downward + Background Images, possibly again re-hashing how to put it together.
Isabeau has written a draft here. Posted as a tutorial.