Bill Phelps wrote:
...You can find all kinds of old stock on ebay pretty cheap.
Bill
True that, but some of it is worthless. If your Tri-X rolls hadn't been frozen, they would be too. Just want John to understand this, because there's no way to know what you're getting if it hasn't been cold stored. However, a partially fogged Ektachrome might help give some of the effects that John is looking for. Outdated film is self-fogging. So, you might look for some outdated film on Ebay with more than one roll in the batch, shoot one and process it, and see if it's worth doing the rest of the rolls. If not, you have some nice slug blackout leader for your projector. If it's somewhat but not severely fogged, you'll get some random variations in density (the blacks wont' be black, in other words).
But don't bother with unrefrigerated film from the 70s and earlier - it will come out clear or nearly so.