Those ghosts featured in episodes 3, 1, 2 and 4 respectively of Series 1, according to Wikipedia.
Thanks again, Jim! It's great to see all the villains and their costumes. Some disappointing attempts (Like the Indian Witch Doctor), but not bad on the whole, with only 5 new molds created, as Tiermann pointed out.
The full episode list is 3, 1, 2, 4, 5, 10, 11, 15, 17 (all Series 1), 19, 20, 23 (Series 2) and that last one from The Scooby-Doo Show. I didnt realise the Headless Horseman has a reversible head (though perhaps if it had been printed all black that would have worked better? Or green, for a live-action green-screen effect?).
I can't wait for the second group of ghosts!
With 200 views (mainly from Guests, I suspect, as there are always many more of them than registered users here on PF) of this topic at the moment, I think your work has been well appreciated, Jim!