Hey Theta,
here are some activities that have worked really well for our chapter.
Question ball - buy a beach ball or bounce ball and write appropriate open ended questions all over it in sharpie (nothing that can be answered with a yes or no) but fun questions like "what did you do over christmas break?" and the girls get in a big circle around the room and toss it to each other and whatever your right thumb lands on, thats the question you answer.. you have to be careful and make sure none of the questions are too personal or inappropriate
Another that I've found is have the girls start with standing in a circle around the room. The Recruitment director stands in the middle of the circle and says 'if you like grey's anatomy over ER take a step forward' and you do little preference questions until the girls are pretty close together, but still enough apart that they arent all on top of each other. At that point you say something like 'do you see how similar we are? we have our own personal interests, but we're a lot alike' and it makes the new girls feel welcome.
These are just my favorites there are tons more out there, and you can even be creative and make up your own, good luck!