I was a member of the smallest sorority on campus - total was 80 and we typically had around 25 sisters. Like it or not, rushees will remember your small chapter size, and possibly cut your sorority for that reason.
We invited alums back for formal rush, held rush in the smallest of the available function rooms in the student center, used lots of balloons, and set up furniture so that it took up space (refreshment table catercorner in a corner of the room rather than flush against the wall, etc). In addition to that, you need the same things larger chapters need - a strong sisterhood, a good display of your philanthropy and social events, and a catchy tune that will stick in the rushees' heads when they leave your party.
Apparently that worked for my chapter last year - they got 12 new members.
Oh yes, we had our share of freaks! We had a girl come through rush one year who was *obsessed* with joining a sorority. She thought for sure that we would invite her back to pref because we needed numbers. Well, we needed numbers all right, but we sure didn't need her! She was sooo pissed off when we cut her, but we really wouldn't have wanted her for a sister. Apparently, she had a huge crying fit when she found out that every sorority had cut her.
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