This alternate poster for Blue is the Warmest Color was shared by IFC, the American distributor of the film.
IFC have a deal with Criterion and it seems very likely that Blue is the Warmest Color will be heading into the Criterion Collection at some point in the future. I think this would make a very fine cover, if it does indeed end up in the collection.
Here’s the UK quad poster for the film. As you can tell from this poster, I’m a fan of the film.