Here's a list of odor absorbing plants (in order of efficiency).
Something I think some rodent breeders and animal keepers in general would like to know and take advantage of.
I added a little Peace Lily to my animal room recently and it's working pretty well so far. If I can find a Lady Palm (no luck so far), I will be adding a few too.
I also know someone who added one of these plants into their rodent breeding room and they said that it significantly cut down ammonia build up and general odor. The difference was really noticeable just in a couple of hours of having the plant.