Let's hear some then.
A scarf on a random character?
That's really an equivalent to, you know, seeing the people?
Well I'm not a writer and don't even have half
the imagination that Moffat does. But I imagine you could still visit classic planets, visit earlier Console Rooms, have classic villains (like the Zygons), follow up a classic story, bring back the Time Lords again, visit Gallifrey before the Doctor left, use footage from classic episodes somehow, have Tennant and Smith relive classic adventures.....
Those would be nice. But, again, the most honest way to celebrate the contributions of the original actors is to include them in the special. Including objects and references just isn't showing the same appreciation.