Network Post: Caprica Six
When I was on the battlestar Galactica, there was a tradition that I found meaningful and comforting. All along a corridor, people placed pictures and mementos of loved ones they'd lost. Sometimes they would visit, pray or light a candle.
Perhaps something like that might be a way to keep alive the memories of those who've gone missing. And for those who came from the sky, a way to memorialize those you weren't able to lay to rest.
If indoors is too intrusive, maybe a memorial garden?