Take a look around campus. Take note of what you like and dislike about other publicity. Avoid using too many fonts on your posters. 2-3 should be sufficient. They are difficult to read, and are not intended to be used for posters.
People are more likely to remember images than words.
Borders keep people's eyes focused on a specific area. Test your poster before copying it. Put it on a bulletin board and stand about 10 feet away. If not, see which poster stands out the most, and incorporate some of its graphical elements. Color can make your poster unique .