I'd say your best bet would be to just befriend anyone who comes along, increasing your social network. As it multiplies, you are bound to find someone who attracts you and that you are compatible with. Usually, you can meet men pretty much anywhere -- in clubs, work place, school, library...
I'm currently in a female-dominated program (going for my Bachelors in Psych.), but I do remember during my single days when I was forced to attend a UN meeting, some guy pretty much just wrote his number on my arm (cause he didn't want me to lose it). At my next class, some football player saw me and the number written on my arm, so he ended up writing his too!
At the end of the day, I had about 4 numbers from random guys.
Anyways, try it! I don't really think that it was the phone numbers written on my arm that got them approaching, but thinking back at it now, it was probably a good conversation starter, thus making it easier to approach a woman. I'm pretty sure wearing an eye-catching accessory or sporting a particular button on your backpack is bound to work also!