Le Club Accorhotels is about to celebrate their fifth anniversary and are offering quintuple (5X) points for one stay by December 31, 2014, that is booked between January 28 and February 18.
Edit 1: A LoyaltyLobby reader commented that he was not able to register for this offer. It maybe targeted to certain accounts and/or countries. My personal registration went through just fine.
Edit 2: This is an open Le Club Accorhotels promotion that all should be able to participate to.
Note that the bonus is applied to the first eligible stay during the offer period