I know it's too late now, but I would have loved for Luna to have returned to what would have been the dark ruins of her homeworld, finding that everyone had gone away or died during some horrific aftershock from Artemis' wish.
With the same backstory as Pokket revealed in the end still in place - that she really did something huge and awful and tried to make amends.
In my own fan-fic ending, Luna would return to her homeworld, walking the long and darkened walkway into the citadel in silence. Upon confirming that her people was gone and reflecting on her part in it she would take a seat amongst the rubble from the crumbling ruins and the camera would pan out from the ruins until we could no longer see her for the dust and debris in the air.
Overall I really enjoyed both the show and its ending and I'm going to miss staying up way to late to catch this madness of a show!