Dude, what sort of problem do you see in the pic that you posted? What's the issue with Catholic (Eastern & Latin Rites) praying together alongside the Orthodox? While the Orthodox are not in union with Rome, the Orthodox Churches certainly can trace their apostolic succession back to the Holy Apostles.
If you're going to go "ecumenical", Dude, go all the way. Where are the chief rabbis and imams in that photo? They, too, supposedly believe in the God of Abraham.