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It should be possible. If you have an ad-supported device it may become tricky.
1. Jailbreak it and enable SSH access.
2. Check the RTC - wake-up should work (I didn't test it yet).
3. Play with eips to display images.
4. Crosscompile wget/curl to fetch data.
Crosscompile image magick to convert/resize the image.
Finally put everything in a script - you can also dis-/enable WLAN temporarily and suspend the Kindle.
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