Brilliant, yet very simple, idea.
When (& if, to some ;0) we finally depart Dens for the shiny Noo Campy, I wonder if we might consider doing something similar at our final game there. We've talked about "The High Stand" often on this & other forums, and we could easily organise something like this for fans to take photos of our departed ancestors, who stood on the terraces during the last century or so of history?
A 'moving on' celebration, while we remember our history in the old place?
German football seems to be fairly good at coming up with some inventive fans participation. Our old friends from Cologne (or FC Koln, to use their formal name) have a very novel 'Club Hymn', quite a recent thing, and with a tune that we all know. They 'borrowed it' from RunRig's many performances at the huge 20,000 capacity Lanxess Arena (& the occasional visit to Hampden), but wrote a full set of lyrics, played & sung by around 40,000 as the teams come out.... https://www.youtube.com/watch?v=nU9QzV8LQQI
or when they invade the pitch, after (I think) winning promotion back to the Bundesliga... https://www.youtube.com/watch?v=XQBVEoyQ5Ts (& I noticed a comment "Das Ist Tradition"....considered part of their tradition already)
For those fluent in German, the lyrics..... https://www.youtube.com/watch?v=ha4GInQjCCU (inventive & efficient bu**ers, those german fans!)