Agreed on Weezer's "decline"...it took me a long time to admit it, but Pinkerton is my favourite Weezer album (one of my favourite albums of all time). As for changing colours: the reason I still like the blue may be because I've only been reading for a couple of months? As the artist, you gotta do what feels right for you. Frankly, these comics are so good that even though my first reaction is "no, pink wouldn't work!" I just assume that you could make any colour scheme work well. ...but I still like the blue :)
I have a strong feeling coloring it anything other than blue would feel soooooo wrong!