There are all sorts of traps out there now. There are blade traps that deal slashing damage, spike traps that deal piercing damage, fire traps that deal fire damage, acid traps that deal acid damage... Notice a pattern? I think it'd be interesting if there were other traps. One that I'd find particularly interesting would be a dispell magic trap. People would think twice before running through that! Or how about a slow trap conveniently placed where monsters can get to. There are plenty of options that don't involve straight damage, why not try them?