killyaquick:

First of all, great job on those corpses!

In addition the ideas I had posted here and the ideas listed here:

-In dark areas of the hayrdie, play spooky sounds. That way, the riders will frighten themselves imagining what sorts of creatures are awaiting them in the dark. LED eyes in the trees and bushes would also do nicely.

-Pike heads. That site also has cool ideas like "Flat Owl" and a pond monster.

-Buy or make faces for trees. Great Stuff expanding foam can simulate the texture of tree bark pretty well

-Scarecrow idea: Put up a bunch of stuffed scarecrow dummies on poles and put large piles of hay underneath. People will expect the scarecrows to leap down at them, but they won't expect a monster (be it person or animated prop) to leap out of the hay!

ahwahneeliz:

This might help you make a T-Rex head. Alternately, you can borrow this hayride's "captured dragon" idea and use a large T-Rex mask instead of a dragon mask.