I personally am very partial to Riley. This is where I lived my freshmen year and where I lived and worked as a Resident Advisor during my sophomore year. To the right is a picture of Riley Hall after its construction in 1927.
Riley is a bit different from most of the first year residence halls; it is made of mostly triples. The rooms are designed to be big enough for three people, so these are by no means forced triples. My roomates and I had MORE than enough room. We did not bunk any beds, and had enough floor space that we could have easily added a couch.
Riley Hall was named after Sanford Riley, class of 1896. Below is a photograph of him and a small bio about his life as a student at WPI. He was obviously a very active student, and until just a few years ago his portrait hung in the first floor common room.
I have some very fond memories of Riley, including but not limited to: my roomies, riley bugs, bringing a couch out onto the quad to watch a movie, the crazy boys who tried to build a hot tub in one of the showers - this is not something I recommend, throwing myself a birthday party, many nights of take out, too many hours of mario kart - which I always won, and of course the boy who voluntarily got duck taped to a wall. 
