Welcome to MobileRead, kreeb.
You do understand the purpose behind "eink" display, and why it isn't backlit? So that your reading experience is as much like reading a paper book as possible?
M-edge makes a cover with sleeve for a built in light for the Kindle. I know there are others out there too......here's a link
http://www.amazon.com/M-Edge-e-Lumin...1063194&sr=8-1