Credit: https://airlinesfleet.com/qatar-airways-fleet-airbus-a350-1000-details-and-pictures/
This livery is very stunning to be honest, and I think that it would go perfect with the A350 that is currently in development.
Qatar has an alliance with One World and so they paint some of their fleet into the One World livery to show that Qatar Airways is a proud member of One World Alliance.