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Philodendrons do well in low light or even no light rooms..You can even sit it outside once in awhile, so it does get some light. They root and grow real easy.
Mother-in-law's tongue (sansevieria) http://davesgarden.com/guides/pf/go/431/ survives in dim locations. However, since bathrooms have a lot of humidity, just make sure you don't overwater it, since they like it on the dry side Other than that, they're pretty indestructible.
Another idea might be to get two identical plants and swap them out every week or two, letting one recuperate in a bright spot while the other does bathroom duty. That's how they were able to keep draceanas in dark hallways at one place I worked. They got swapped out every couple of weeks for some R&R.
I agree with doing the switch, leave a plant in the bathroom for a few weeks, then switch it with another that is getting good light. I recommend snake plants or philodendrons. I keep phildondrons growing in water in darker parts of my house.