Kobe/Artest, off the top of my head. Durant/Harden, probably.
Green hasn't shown he can defend at the highest level yet, but he was also in a poor system in OKC and playing out of position.
I can understand the Artest argument, but Kobe? I know he's a good defender, but he's giving up 2 inches and about 30 pounds trying to defend Lebron.
Same is true for Harden, who happens to be a terrible defender...and Durant isn't exactly fantastic on that end either. To be honest Durant and Ibaka would probably have a better chance.
Pierce is strong enough and big enough to pressure Lebron, while Green is skinnier but has the height and length to give him trouble. Both are above average defenders as well.
The only other combinations I can think of are:
* LA Clippers (Hill and Odom)
* Bulls (Deng and Gibson)