I thought about this the other day - I'm from Pittsburgh and all of our sports team colors are black and gold. I was thinking about getting black and gold sport bands to do this (I have season tickets for the Penguins every year so I'd probably get my money's worth just wearing them to games).
Nope -- though I did see someone wearing colors to match their favorite sports team. Unfortunately those colors don't exist for me (though I've tried to find 3rd party with no luck)
That would be awesome!!!
And I'm very jealous that you have season tickets!