If your talking about the power and drive lights, try replacing them with these:
http://www.directron.com/blueled.html
I bought them for an Enermax case, but when I took the front off I saw that the lights where attached with a hot glue gun. So I chisled the glue off, and drilled new holes for the lights since they were to big. Glued them back in, and it works great! Super bright, too, lights up the freaking room.