Are you getting tired of the three ugly green lightdiodes that is attached to almost every keyboard, to indicate Numlock, Capslock and Scrollock? You are not alone, blue or red would be much better. It isn’t actually that hard as it might sound, just buy three lighdiodes which fits and replace them, simple as that. Modtown has actually written an article about how to do it. Just remember, you don’t take apart all keyboard at the same way, so don’t panic if it doesn’t look the same.
Read the guide here.