I wanted blue because my last bike was blue and I loved the way it looked in photos. Plus it's the Yamaha color.
Then I saw the red. Sweet. Plus it was a leftover '07 so it was cheaper and it was a really beautiful bright red (here come the comments as to why it was a leftover.....the dealer unpacked it only a month ago - I was there when it came out of the crate and fell in love immediately).
I love the look of the FZ6 in any color. Even with my CalSci windshield I think it looks hot. Like a big, angry wasp.