Quentin Tarantino's Casino Royale.
Before the (I reckon great) reboot of Bond in 2006, Tarantino was thinking about an adaptation of the first 007 novel. He would have done it all film noir like, black-and-white and set in the 1950s, and as a film of his own, without the Monty Norman theme or any canonical ties to the main series (though he would have put Pierce Brosnan in the role of Bond).
The Kill Bills of 2003 and 2004 feel like a bit of a waste to me,[nb]I've not 2007's Grindhouse, but I understand that it hasn't fared well.[/nb] two films that he needn't have bothered making. But I love Inglourious Basterds, so a stylish, black-and-white, 1950s James Bond would have been something to see. As long as Tarantino didn't cameo as Felix Leiter.