Volunteer for some kind of really different organization. Something strange or something that you'd normally never think of doing. Not only will this create a differentiating point on your CV, it'll show that you're willing to move out of your comfort zone and experience new things and new people. And who knows what kind of network effects that'll have.
Another easier-said-than-done one is to figure out exactly what you want to do. Having a laser beam focus on some objective will set you apart and give you a goal to move towards. Often you won't know what this is until you get your feet wet in some aspect of it, so maybe the first suggestion is better starting place.
I'm a current Corporate Residency MBA student at Dalhousie University (Nova Scotia, Canada).
This account is to help spread the word about this unique program, as well as to help provide a student perspective for MBA applications and GMAT experiences.
Every week I publish a blog about life in the CRMBA by interviewing current students. Find us on Twitter and Facebook, or post any questions/comments/concerns in this thread here on gmatclub.com
Highlights of the program include:
Specifically designed by Corporations/Employers, No work experience necessary, 8-month paid corporate residency, Grades/GMAT score not the main focus for admittance