That's a great idea with the e-reader.

I would love for someone to design a great case with a built in e-reader on the back. Most of the existing ones seem geared for displaying colour photos; I'd like one built for reading, powered by NFC. It should easily sync up with the phone itself to send over articles, books, etc. Bonus if I can write on it.

https://www.inkcase.com/inkcase-for-iphone/

A few options exist in the market