Put a head or some floating brains in it. Run some EL lighting wire to create a life support system. Or, put an arm bone, add some flesh to it and then attach Piranha fish and run air out where they are feeding.
It was nothing really fancy but several years ago, I made a sculpey brain for a party and put it in my old tank, along with a doll eye (would've used two, but I'd misplaced the other one). Added some highlighter dye to the water and put a blacklight in the fixture.
The brain had two screws in the "temples", to which copper wire was attached (there were also short bits in the end of the medulla oblongata). The wire attached to a thin wooden bar placed under the light fixture, suspending the brain midway in the tank. Air trapped in the doll eye and the natural rigidity of the tubing made the eye tend to float. A long air stone was placed in the bottom to provide "oxygen" (and the circulating water from that and the filter in back made the eye tend to bob around randomly a bit)
Nowadays I'd do something more elaborate, possibly using 3d printed parts (i.e. trim on the tank, mad scientist widgets, etc.) I still have the brain and eyes, but I'd have to get a new tank (or use one of those giant cheese puff containers like some people do)
I sometimes need to attach things to foam. In one instance it was a foam tombstone that I needed to attach to a thin plywood base, so it would stand up on a stage. Many years ago, I recall seeing someone use what I thought were drywall screws. But, that didn't hold at all on the polystyrene...
Hey guys, I interviewed this gentleman who had a giant collection. The reason I am posting it in props is because, he makes 1:1 Scale characters and they are very good. He also sells them so check it out. We see a bunch of them in the interview.
Have you created any photo ops and incorporated scare props?
we had folks taking pictures with some of our static props (crypts, Corpses, mausoleum), so I wanted to build something specifically for photo ops.
I’ve seen the electric chairs that vibrate/flash when unsuspecting ToTs sit down...