I saw a horror movie in ~1991, it was a VHS rental. It was a horror movie, in color. I was 11 at the time, and was creeped out, so I don’t remember too many details. I remember early on in the movie, there was a decapitated head, rolling outside, like someone kicked it. There was a toilet, full of maggots.
It seemed to have a film student feel to it. Not much dialog, just a lot of creepy scenes… at least early on. I would guess it was from the early 90’s, or possibly the 80’s.