Board Thread:Suggestions forum/@comment-32926935-20170912001931/@comment-26556622-20171110090442

Depends on what period you take the banner from, either before or after the kingdom has been taken over by the Gwaith-í-Mirdain. Before it would have probably something relating to Celeborn or Galadriel, afterwards it would be the 16 pointed star of Feanor on a field of dark red possibly.