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I think the screensaver image is cached. Also, it would be hard to extract the image from the mobi file if it has DRM. And it would need a different mechanism for Topaz books.
I had an idea earlier that went something like this:
1. Disable display of the normal screensaver images, but leave other power saving functionality in place.
2. The framework has events for screensaver time lapse. Wait for one of these events.
3. At the event, send keys to go to the cover of the book (Menu, Go To..., cover)
4. On resume, send the Back key to return to the user's reading location.
The trouble is that it looks bad (you briefly see the effect of the keys being simulated), and you would have to be very careful that the user is actually reading a book, or otherwise you will send random keys with undefined consequences.
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