My first thought was whether they might eat roaches. Not that I ever see a roach in my house, you understand, but a houseplant with the capability of eating them might be of interest to some people. Plants that capture and digest animals occur in many parts of the world, and several distinct kinds live in North America. Pitcher plants and Venus' flytraps are relatively well known. Sundews and butterworts are less so.
Bladderworts are probably the least familiar of our carnivorous plants.
Most of these plants live in highly acidic wetland habitats low in soil nutrients. To survive under such conditions, plants must have mechanisms to compensate for the low availability of nutrients. Carnivorous plants lure and capture their prey in different ways. In some, the plant actually moves, most in slow motion but some with alacrity. The one with the most pizzazz is the showy Venus' flytrap, whose modified leaves perform a special magic trick for insects.