Halloween Decorations

Hi guys, so I’m going to take a break from my usual type stuff for a moment and ask if any of you guys have any good idea for cheap Halloween decorations?
I absolutely LOVE Halloween, almost as much as Christmas, but I’m also a student with little to no money.

I was wondering if you knew of any DIY decorations I could try make or anything. Preferably out of something like beer bottles (there’s loads of those in our house, but I don’t drink) or other stuff I could find in a house being rented by college student.
Thanks guys 😀