Here's a really good theme. 10 ordinary people completely cut off from the outside world where they will have every moved scrutinised by the viewing public for 9 weeks, 24 hours a day. They will have to nominate each other to face the public vote and the public will get to evict one housemate per week. They will have to abide by the oppressive big brother's rules, who will only acknowledge housemates in the diary room.
Oh wait... This sounds familiar.
Tasks will see them win food which will always be a test of endurance, strength and perseverance. Not 'guess who said what about who'.