Can never understand why clubs change the shade of colour they play in. I'm pretty sure that Peterborough used to play in something like a navy/royal blue, now they're wearing something akin to our Kappa Lazer blue. The Italian national side have done the same thing as well, they're wearing a noticeably lighter blue than in the days of Rossi, Baresi, Tardelli etc.
And yes; I'm aware of our spell in the aforementioned Lazer blue. But it wasn't as dissimilar to our regular colour as the two I mentioned above.