I noticed some other ROM had done this, but I couldn't find it. So I modified the EasyOneHand.apk to attempt to make it have a black background, to save power and save your eyes in a dark room. After all, black pixels use zero power on an OLED screen.
[As luck would have it, the chef of the X-NOTE rom responded and told me his ROM was the one that had it. Of course, I didn't see his response quickly enough and I had already gotten impatient and did it myself, so I thought I'd post it anyway. Credit to him for the inspiration for my learning...]
I have attached my mod as well as the original stock files (APK and ODEX) for replacement. I have added an Update.Zip for those who prefer to let the magic happen automatically. There is also a dark version - just be sure to rename it and overwrite the existing file to install it. The dark version intentionally has white edges so you can easily see where the screen border is.
Extract this to your /system/app folder, overwriting the existing one. Be sure to delete the corresponding ODEX file if it exists. Set the permissions to the same as the other files in the folder (chmod 644).
Let me know how it works for you!
* Added Update.zip
* Added dark version (2013-11-17)
Before/After show the look before and after my mod.
Settings01-03 show how to enable one-handed mode and the built-in tutorial for how to use it. See the FAQ post below for details.