And there is always this custom cover from Korea:
The choice of colors and materials reminds me of slipper.
First mentioned here from the person who requested the custom cover:
https://www.mobileread.com/forums/sho...over&page=3#35
The company even posts a comment in the thread about availability.
Company that made it:
http://www.hevitz.com/front/php/prod...isplay_group=1
Now it looks like it can be ordered online but when doing so produces a message that I think says it's out of stock. I have no idea about international shipping. 69,000 원 translates to about 62 USD.