Alienware Command Center  Go to Support.dell.com and enter service tag of your computer.  Go to Drivers and download and find Alienware command center under application.  It allows to customize Keyboard lights, Thermals and Overclocking (selected models only)   
I have a Dell G15 gaming laptop I got a few months ago. There isn't a section for gaming laptops so it forced me to choose Insprion instead which is why this is here. When I got it, I easily found the option to customize the colors of the keyboard. I just realized though that the custom colors are not showing up and I cannot find ANYWHERE the settings page I used to change them. I have tried searching "keyboard" "lighting" "backlight" etc and nothing comes up. I don't remember what it was called, but it gave like an entire color wheel to choose from and options to change all of the keys or sections of the keyboard so I made the main keys blue and the num pad keys pink. Photo below of how it should look, but currently it only shows me a random turquoise-ish color for all keys. I've searched around Google for answers and all I can find is how to turn the lights on/off or responses like "Your keyboard doesn't let you change colors". So I'm not looking for responses like these. Thank you! [IMAGE]
Change keyboard backlight