I generally like Miku portrayed with green hair instead of blue, I don't know why, just more aesthetically pleasing to me.]
Also, I was looking for a pic that I saw a few years back and Miku had green hair in it. It was drawn by a very popular artist and it was a very detailed, sparkly, beautiful picture. I think I remember seeing the artist draw some story of evel stuff. Does anyone know what pic i'm talking about? Sorry, can't give too much info