I created an inverted file with black page and white text. I created a simple HTML file then used calibre to convert it to MOBI and ePub. The ePub works great on my Sony Pocket edition (see attached photo). However, the MOBI just shows up as a white page with white text, in other words a blank page. I loaded it on my Kindle DXG along with the *.HTML file renamed to *.TXT. The MOBI showed up blank and the TXT file looked like a normal book, that is black text on white page. Apparently the Kindle overrides a back page and turns it white. I attached the files for anyone who might want to test this out. I really don't think it looks good in low light siutuations, but someone else might.

...