Very early on, I was asked to think of a way Venom could act separately from Eddie in the same room, kind of like an annoying roommate would.
In my mind it was clear that a Symbiote without its host wouldn't be able to have a proper functioning body, so I imagined that Venom would remain attached to Eddie by strings and filaments and look like an amorphous blob.
He would still be able to do stuff, drool everywhere, be noisy and extremely distracting to Eddie, which just needs to finish writing his article.. but he would do that while looking like a molten tire with teeth.
I prepared different level of "amorphousness", with nr. 4 being my personal favorite.