While this will work with pretty much any keyboard, it's best done with a keyboard that has a USB port built-in so you can plug the el-wire into it. If you don't have one, of course, you could always just twist the el-wire's USB cord with your keyboard's and plug it into the back of your computer. The instructions are pretty straightforward — you'll need to take your keyboard apart (really apart, as in removing every single key), but just be sure to remember the keys' order and you should be fine. Check out the video above for detailed instructions.
How to Make a Backlit Keyboard [Tinkernut]