You may choose to design your poster from scratch, but sometimes a template already exists that may fit your needs. Check out examples of real posters to get ideas that may work for you.
Here are some PowerPoint templates to get you started. Feel free to change the colors and layout as needed. These templates are within the PowerPoint page size limit of 56" and comes in several different aspect ratios, each of which can be printed in a number of sizes (as listed)
Contains tips on design issues as well as sample posters and templates. Created by Michael Alley, author of The Craft of Scientific Writing. From the Writing Guidelines for Engineering and Science Students at Pennsylvania State University.
View posters with evaluative comments from the Creating Effective Poster Presentations web site by George Hess, Kathryn Tosney, and Leon Liegel. North Carolina State University