Dad had a parts car 1.7l -4 he wanted to do something with. I remember picking up. It sat off to the side of a gas station for years, it was rough and previous owner had pimped it out. It had purple seat inserts. Not nice looking, it was like fake fur.
I found a dead fish behind the back pad, by the time we got the car, it was a bit a less smelly, but someone must not have liked the person who owned the car, to take the seats move them forward, loosen a few screws and toss a fish behind the back pad and button it all up.
Maybe it was a John, or a hooker that hated their pimp.
Needless to say we never cut into any of the cars to make them any of these, but Dad collected the materials. Glad it helped someone, or at worst provided an emotional release.