Some ideas off the top of my head; chainsaw gun:fires chainsaws; firing effects: when guns that use gunpowder fire, produces a flare effect; ocean map: not actually water, but some items float to the top and others sink to the bottom; Car battery: if you stab the ragdoll with it, he is electrocuted, and if triggered explodes with acid; Magnifying glass: raises the temperature of objects near it; and finally NaPalm: burns far hotter than gasoline. + if you agree
Burning items already get charred if you have Settings > Visual > Effects on.