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This is the kind of paper prop that might as well have a big neon sign saying "Important plot information inside!" bolted onto it.
"For your own creature you could do anything you want, and you don't have to follow my design at all, but I'm a Lovecraft nerd so it's pretty obvious why I picked this design. Any kind of simple design will do, very simple work could even be beneficial for a build like this since the simpler it is the older it can look, so don't doubt your sculpting skills here. I have terrible sculpting abilities and I put this together in about half an hour, so trust me when I say I know all you guys and gals out there can do better."
"Aging it was pretty simple and straight forward. First, I attacked it with a small file, roughing up all the edges and just fraying the heck out of it. Then I took an X-acto knife and made light, quick slicing motions all over it. This loosened up all the threads, which I then just picked at until I had the right amount of wear. Through it all, I used some patches from my father's old army jacket as references.
I also used the knife to cut away some of the plastic backing -- this allows the patch to curl and warp a bit more.
Finally, I soaked it overnight in chai tea. It's a bit lighter than straight black tea, which was closer to the look I wanted. Plus, it gave the patch a nice cinnamon-y smell, which covers the stench of pure evil that had otherwise permeated it. :) "