Why are all of Pittsburgh's teams Black/Yellow/White?
 

yes

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i think the penguins used to have blue jeresey's at one time

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indeed they did

blue and white with "Penguins" written diagnally

And they had the blue and white ones with the Penguin logo in the middle.

yellow and black somehow = steel city. Same as Hamilton in Canada.

Never noticed that.

Now that I think about it, a lot of the Dallas teams here have a blue/white/grey thing going.

Cowboys: Blue/White/Silver
Mavericks: Blue/White
Rangers: used to be Blue/White/Grey I think there's some red in there now too though
Desperados: Blue/White

The only odd one out is the Stars with their black and green crap. Any other cities that have common colors for all the teams?