It depends. You'd have to look up your parts and make sure they are ATX-form compatible, which they probably are.
Take off the side of your comp and find out what kind of motherboard and power supply you have, or if you can't find that just find some number/letter sets and punch them into google.
Blue is a nice color
Try xoxide.com for lighting and fans, they have great stuff. I just recieved a green cold cathode light from there which works incredible. Try the crystal neon or liquid neon ccfls!