Two Lightnings is freaking cool though. Even though the 295X2 pricing has got uber aggressive lately it's still not dropped below the price of two reference 290X's which is quite surprising really. One would think you stand a better chance when overclocking on individual cards especially under water when you have two lots of power circuitry, not that any of the reference cards have overclocking headroom. Shame they all didn't have good coolers otherwise I think they would have been a seriously long lasting 780/970 rival.
Adding blackness could always work, a black waterblock

, should be a cool mod, I wonder if there is scope to fit a bigger radiator and make it uber quiet.
JR