Why didn't Boeing make the Sky Interior for the Boeing 777?
I don't know if it is an exception, but Ukraine International Airlines seems to claim that they have a Sky Interior in their 777. User gparyani comments that this claim may be mistaken. I'll leave this answer here in case somebody else independently comes up with the same thing.


  Welcome on board modern Boeing 777-200ER airliner! The aircraft’s quiet and cosy cabins are equipped with comfortable reclining seats, contemporary Sky Interior [...]


https://www.flyuia.com/ua/en/services/long-haul-b777