Snakes or worms coming out of the wall, I know it's weird

I was thinking of doing the same effect that it has on the p.t. concept movie…

Some kind of particle effect might work quite well, since there are lots of worms. Maybe you could use a ribbon renderer in Niagara to connect the head and base of the worm with a body. I’m fairly new to particle systems though so please don’t ask me for any more detail than that - have a look at some tutorials or the Niagara example maps in Content Examples. I’m sure I’ve seen a couple of things that with some work and adaptation you could use to achieve this effect.