Here is Zorro and her horse -
And Holden, well, we may need to explain...
There's a dubstep recording artist named Deadmau5 (Deadmouse). He wears a mouse head when he performs and Holden wanted to make a head just like his. It took a bit of work, but it looked GREAT!
And then there were the Jack-O-Lanterns.
From right to left we have:
Andy: a Zorro sign in honor of Sydney winning the costume contest
Julia: normal evil pumpkin
Holden: sad pumpkin because someone pounded nails into his face - see closeup below
Sydney: Barad-dûr. In the Lord of the Rings this was the Dark Lord Sauron's primary fortress in Mordor, serving as his base of operations and the primary nexus of evil in Middle-earth. If you want to know more, you'll have to ask the expert.