Now what sort of question is that?! All our pipes turn blue, plus every other colour of the rainbow - it's a fact of life. What stops them looking blue is decent heat shields. So get yourself a 2-into-1 that comes with a set of heat shields, like SuperTrapp.
Yep, all correct replies so far. As stated, any chrome/nickel plated exhaust will blue/gold. For example, the Vance and Hines Shortshots blue and gold like crazy. But, you don't see that, because V&H does it's a very common visual trick with their pipes...full coverage heatshields!
Triumph bonnevilles practically roll of the line with blue pipes. Every pipe will blue. The reason you dont see it on every bike is because you dont see the header, you see the heat shield.