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• Events: BBQ's, Picnics, Movie Nights, Ice Cream Socials, Trick or Treat Down Greek Street, Service Projects, etc.
• Direct Mail Campaigns
• Flyers
• Posters
• Chalk the sidewalks (get permission)
• Hang banners outside the sorority houses
• Place signs around campus (get permission)
• Pitch article ideas to the School Newspaper
• Updated Panhellenic Web Site
• Word of Mouth
• Remind sorority members that they serve as PR ambassadors for the Panhellenic Community: actions and words of one person can fall back on the entire Greek System
• Start a PR committee and have at least one PR rep from each sorority on your committee
• Create a Panhellenic t-shirt and get the sororty members to wear them
• Take out ads in the school newspaper
• Staff up a table in or around the Student Union (get permission)
• Are there any electronic billboards on campus? Promote your events this way, too
• Buy chotchkes like buttons and pens with your web site on them and a Go Greek message
• Staff a table at a student activities fair
• Get permission to make a presentation at freshman and transfer student orientations
• Brochures
• Get Greeks involved in other campus activities where they can promote Greek Life and their organizations to non-members
• Host Panhellenic Mixers with groups on campus like the Residence Hall Association, Honor Societies, the Ladies' Crew Team, etc.
• Greek Letter Days: once a week, everyone who is Greek wears letters on the same day
• Greek Week
• Homecoming participation
• Have a competition among the sororities to promote Greek Life on campus and award a prize or title to whoever gains the most points
• Keep a list of unaffiliated women and invite them to recruitment or a Panhellenic event with a personalized eblast

And most importantly, develop a PR plan with tangible goals and ways to measure those goals.