I don't think there is a 760 which has a Blue theme necessarily, but there is a GTX 760 I am aware of that has a blue PCI.
Try and look out for MSI and Gigabyte's lineup, they're usually gray/blue or whatever.
Personally, I would just get a decent-looking gray one, and they're cheap too.
Here's the cheapest, but it's hideous in my opinion.
PCPartPicker part list /
Price breakdown by merchant /
Benchmarks
Video Card: PNY GeForce GTX 760 2GB Enthusiast Edition Video Card ($236.99 @ Amazon)
Total: $236.99
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-05-06 22:32 EDT-0400)
The cheapest, decent looking one would be:
PCPartPicker part list /
Price breakdown by merchant /
Benchmarks
Video Card: EVGA GeForce GTX 760 2GB Superclocked ACX Video Card ($249.99 @ Newegg)
Total: $249.99
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-05-06 22:33 EDT-0400)