I think the whole idea of LEDs and Neons go with age, as in everyone has a phase where they want bloo everywhere.
I do think the blue looks much nicer than the green and orange thought in respect of power and HDD.
My lian li PC402a has a red and blue for power and HDD and it's just not quite right to me.
I have a champagne CM ATC200-CX1, gold front, that once i've cleaned it up i'd like to change the led colours and the two front intake fans for led ones (no side window panel for it).
I'm still debating on colours. Purple, yellow, orange - i think purple will be more striking though