Make it obvious that you are the author and not just another viewer. Actively engage each person who approaches your poster. Rehearse a brief summary of your research that you can present to those in a hurry. And finally, don't be afraid to highlight areas that are not totally worked out, since this is where you might get the most benefit from feedback. It's better to have several people standing next to your poster discussing ways to improve the study than to be standing all alone.
Posters can be as individual as their presenters.
After all, no one else has the same perspective of your research or understands the particular questions that you are asking. This diversity of style may also reflect personal preference in regard to graphic design. On the other hand, poster sessions, as informal as they seem, are probably the method by which an overwhelming proportion of technical information is passed during meetings, so the way in which they are designed deserves more than a passing glance.